The Firefox del.icio.us extension is kinda neat, but so much more could be done. With Firefox's GUI, a complete gui-based bookmark manager could be created that merely uses del.icio.us as an online storage and synchronization server.
The following would be great:
- Complete replacement of the Firefox bookmark system
- Automatic synchronization of bookmarks with del.icio.us
- GUI version of nutr.itio.us, built into firefox that runs locally
- Query whether current page is on del.icio.us
- Related-tag features...