I recently uploaded all my bookmarks onto Delicious, which lets me multi-tag items so I can find my Library Resources page whether my brain is processing “reference” or “business.” (Of course, just because it’s online doesn’t mean you shouldn’t back up the data.)
The ability to access all my bookmarks from any computer is a useful tool. But what I really like is the option to add notes to an entry. This morning I set up a “prospects” tag. Every time I read about a company that looks interesting, I can not only Google it and tag the Web site, but I can include brief comments about where I heard about the company, any potential contacts, and other relevant data. Plus just having a prospects folder reminds me that I need to follow up.