del.icio.us
This is one of the Learning 2.0 technologies that I fell in love with. The other of course being RSS feeds.
I created an account. I discovered that I could import my booksmarks so didn't have to visit each of the sites and add them to my account. That saved a lot of time. Once I found out that doing so would autamatically add the folder name as a tag to the links I decided I needed to first clean up my favorites. I had so many outdated links and things not in folders. Once I had all the links in folders I was much happier with the del.icio.us tags. I found the instructions on the del.icio.us site on how to delete all previously imported bookmarks. Not very easy, but at least fast. You have to delete and recreate your account. This is one of the few sites that lets you use the same user name for the newly created account. Most won't let you use the same user name if you delete the account.
All in all this one of the technologies that I will continue to use. See my blog entries for creating a Network badge.