Today I found a couple other interesting bookmark tools:
1. Simpy – This is a lot like del.icio.us but seems a bit more polished and commercial. It has a few extra features, while maintaining most of the features of del.iciou.us.
2. Cocoal.icio.us – A carbon del.iciou.us bookmark viewer that takes advanatge of Apple’s webkit to show webpages within the same window. Pretty cool software, I’d love to be able to select multiple categories as filters (e.g. show only bookmarks that fall under both macintosh and software). Freeware.