I am crossposting this from /g/ because it fits here as well:
I'm sure there are many image collectors on this board.
I am currently working on a simple image tagging software.
Everything i found on the web was too bloated for my taste, so i want to keep it simple.
Here is what i have so far (see pic).

Features on my ToDo list:
- Slideshow
- Better configurability of observed folders. Currently hardcoded.
- Hotkeys for adding and removing tags
- Performance tuning when 5000+ pictures
- Portability: User definable database locations

I'm probably going to release this at some point if there is some interest. Which features would you be interested in?