- user settings page to change email/password, set time zone
- handle sprites with semi-transparent pixels (and possibly try to threshold the alpha on them)
- cycle through differences between sprite edits
- [IMG] tag generation for sprite images
- undo
- flood fill
- edit colours in palette (automatically replacing pixels on canvas)
- height guide
- background image to pixel-over
- actual-size preview
- replace colour tool
- keyboard shortcuts
- layers
- shift image or marquee tool
Palette icon taken from the "Silk" icon set (v1.3, Mark James, http://www.famfamfam.com/lab/icons/silk/).