Great:
* speed. it's hella fast!
* nice to be able to browse via filesystem

Bugs:
* need to type something in the regiistration field before the 'demo' button becomes active.
* asks for my keychain authorization when I try to open the preferences. I said 'deny' and it worked ok.

Feature requests:
* I'd be nice to be able to have a side panel to show a larger version of the image, versus the new-opening window. Especially for us widescreen users.
* Watermark should work on multiple pictures at once. Cool feature. Not sure how much I'll use it, as exporting to 800x600 is sort of a watermark/limiter in itself :)
* Add the rotation buttons to the toolbar
* tags, etc, but then you're getting more fully functional/database oriented.

Nice work! :)