diff --git a/main.go b/main.go
index 173ce36..051727d 100644
--- a/main.go
+++ b/main.go
@@ -1,20 +1,86 @@
 package main
 
 import (
+	"crypto/md5"
+	"errors"
 	"fmt"
+	"io"
 	"log"
 	"os"
 	"path/filepath"
+	"strings"
+	"sync"
 
 	"github.com/rwcarlsen/goexif/exif"
 )
 
-const usage = "picmv <indir> <outdir>"
+const usage = "aj <indir> <outdir>"
 
-type input struct {
+type file interface {
+	move(root string) error
+}
+
+type jpg struct {
 	path  string
+	hash  string
 	year  string
 	month string
+	time  string
+}
+
+func (j jpg) move(root string) error {
+	f, err := os.Open(j.path)
+	if err != nil {
+		return fmt.Errorf("problem opening jpg file: %v", err)
+	}
+	defer f.Close()
+
+	content := filepath.Join(root, "content", j.hash[:2], j.hash[2:]+".jpg")
+
+	if _, err := os.Stat(content); !os.IsNotExist(err) {
+		return dup{content}
+	}
+
+	out, err := os.Create(content)
+	if err != nil {
+		return fmt.Errorf("could not create output file: %v", err)
+	}
+	defer out.Close()
+
+	if _, err := io.Copy(out, f); err != nil {
+		return fmt.Errorf("trouble copying file: %v", err)
+	}
+	if err := os.MkdirAll(filepath.Join(root, "date", j.year, j.month), 0755); err != nil {
+		return fmt.Errorf("problem creating date directory: %v", err)
+	}
+
+	date := filepath.Join(root, "date", j.year, j.month, j.time)
+	name := date + ".jpg"
+	for i := 0; i < 10000; i++ {
+		if _, err := os.Stat(name); os.IsNotExist(err) {
+			break
+		}
+		name = fmt.Sprintf("%s_%04d.jpg", date, i)
+	}
+
+	// TODO: or maybe symlinking? (issue #2)
+	// rel := filepath.Join("..", "..", "..", "content", j.hash[:2], j.hash[2:]+".jpg")
+	// return os.Symlink(rel, name)
+	return os.Link(content, name)
+}
+
+type media struct {
+	path string
+}
+
+func (m media) move(root string) error {
+	return errors.New("NYI")
+}
+
+type stats struct {
+	total int
+	dupes int
+	moved int
 }
 
 func main() {
@@ -23,51 +89,201 @@ func main() {
 		os.Exit(1)
 	}
 	in, out := os.Args[1], os.Args[2]
-	log.Printf("%+v", in)
-	log.Printf("%+v", out)
 
-	count := 0
-	files := make(chan input, 20)
-	// seen := map[string]bool{}
+	if err := prepOutput(out); err != nil {
+		fmt.Fprintf(os.Stderr, "problem creating directory structure: %v", err)
+		os.Exit(1)
+	}
 
+	exts := map[string]bool{
+		// images
+		".jpg":  true,
+		".jpeg": true,
+		".png":  true,
+		".gif":  true,
+
+		// videos
+		".mov": true,
+		".mp4": true,
+		".m4v": true,
+	}
+
+	work := source(in, exts)
+	streams := []<-chan file{}
+
+	for w := 0; w < 16; w++ {
+		streams = append(streams, parse(work))
+	}
+
+	st := stats{}
+	for err := range move(merge(streams), out) {
+		st.total++
+		if err != nil {
+			switch err.(type) {
+			case dup:
+				st.dupes++
+			default:
+				log.Printf("%+v", err)
+			}
+		} else {
+			st.moved++
+		}
+	}
+
+	log.Printf("dupes: %+v", st.dupes)
+	log.Printf("moved: %+v", st.moved)
+	log.Printf("total: %+v", st.total)
+}
+
+func prepOutput(root string) error {
+	for i := 0; i <= 0xff; i++ {
+		dirname := filepath.Join(root, "content", fmt.Sprintf("%02x", i))
+		if err := os.MkdirAll(dirname, 0755); err != nil {
+			return err
+		}
+	}
+	if err := os.MkdirAll(filepath.Join(root, "date"), 0755); err != nil {
+		return err
+	}
+	return nil
+}
+
+func source(root string, exts map[string]bool) <-chan string {
+	out := make(chan string)
 	go func() {
 		err := filepath.Walk(
-			in,
+			root,
 			func(path string, info os.FileInfo, err error) error {
 				if info.IsDir() {
 					return nil
 				}
-				f, err := os.Open(path)
-				if err != nil {
-					return fmt.Errorf("problem opening file: %v", err)
-				}
-				defer f.Close()
-				x, err := exif.Decode(f)
-				if err != nil {
-					log.Printf("problem decoding exif data %q: %v", path, err)
-					return nil
-				}
-				tm, err := x.DateTime()
-				if err != nil {
-					return fmt.Errorf("problem getting datetime from pic %v: %v", path, err)
-				}
-				files <- input{
-					path:  path,
-					year:  fmt.Sprintf("%04d", tm.Year()),
-					month: fmt.Sprintf("%02d", tm.Month()),
+				ext := strings.ToLower(filepath.Ext(path))
+				if _, ok := exts[ext]; ok {
+					out <- path
+				} else {
+					log.Printf("ignoring: %q", path)
 				}
 				return nil
 			},
 		)
 		if err != nil {
-			log.Printf("%+v", err)
+			log.Printf("problem during crawl: %+v", err)
 		}
-		close(files)
+		close(out)
+	}()
+	return out
+}
+
+func parse(in <-chan string) <-chan file {
+	out := make(chan file)
+	go func() {
+		for path := range in {
+			f, err := _parse(path)
+			if err != nil {
+				switch err.(type) {
+				case notMedia:
+					log.Printf("%+v", err)
+				default:
+					log.Printf("%+v", err)
+				}
+				continue
+			} else {
+				out <- f
+			}
+		}
+		close(out)
 	}()
 
-	for in := range files {
-		log.Printf("%+v", in)
-		count++
-	}
-	log.Printf("%+v", count)
+	return out
+}
+
+func move(in <-chan file, root string) <-chan error {
+	out := make(chan error)
+	go func() {
+		for i := range in {
+			out <- i.move(root)
+		}
+		close(out)
+	}()
+	return out
+}
+
+func _parse(path string) (file, error) {
+	ext := strings.ToLower(filepath.Ext(path))
+	var r file
+	switch ext {
+	default:
+		return nil, notMedia{path}
+	case ".jpg", ".jpeg":
+		f, err := os.Open(path)
+		if err != nil {
+			return nil, fmt.Errorf("problem opening file: %v", err)
+		}
+		defer f.Close()
+		x, err := exif.Decode(f)
+		if err != nil {
+			// TODO: sometimes valid jpgs have bad exif data (issue #1)
+			return nil, notMedia{path}
+		}
+		tm, err := x.DateTime()
+		if err != nil {
+			return nil, fmt.Errorf("problem getting datetime from pic %v: %v", path, err)
+		}
+		if _, err := f.Seek(0, 0); err != nil {
+			return nil, fmt.Errorf("couldn't seek back in file: %v", err)
+		}
+		// TODO: multi writer with this to decide if it's valid jpg?
+		hash := md5.New()
+		if _, err := io.Copy(hash, f); err != nil {
+			return nil, fmt.Errorf("problem calculating checksum on %q: %v", path, err)
+		}
+		r = jpg{
+			path:  path,
+			hash:  fmt.Sprintf("%x", hash.Sum(nil)),
+			year:  fmt.Sprintf("%04d", tm.Year()),
+			month: fmt.Sprintf("%02d", tm.Month()),
+			time:  fmt.Sprintf("%d", tm.UnixNano()),
+		}
+	case ".png":
+		return nil, fmt.Errorf("NYI: %q", path)
+	case ".mov", ".mp4", ".m4v":
+		return nil, fmt.Errorf("NYI: %q", path)
+	}
+	return r, nil
+}
+
+func merge(cs []<-chan file) <-chan file {
+	out := make(chan file)
+	var wg sync.WaitGroup
+	output := func(c <-chan file) {
+		for n := range c {
+			out <- n
+		}
+		wg.Done()
+	}
+	for _, c := range cs {
+		go output(c)
+	}
+	wg.Add(len(cs))
+	go func() {
+		wg.Wait()
+		close(out)
+	}()
+	return out
+}
+
+type notMedia struct {
+	path string
+}
+
+func (nm notMedia) Error() string {
+	return fmt.Sprintf("not media: %q", nm.path)
+}
+
+type dup struct {
+	path string
+}
+
+func (d dup) Error() string {
+	return fmt.Sprintf("dup: %q", d.path)
 }