social bookmarking
Here's a couple of new toys I'm planning to try.
Librarything.com allows a user to store a "bookshelf" of titles and then connect with other people who read similar stuff or who want to exchange ideas about the books in your library.
Del.icio.us stores your bookmarks online so you can access them without being at your own computer. It also allows a user to tag their bookmarks so you can organize and search your bookmarks as well as other peoples'. This seems particularly useful for finding quality blog entries on spicific topics, since search engines often have trouble indexing individual blog posts.
Let us know how your picadas turn out. We are anxious to see if gringos can make them too. :)
If you listen to music on your computer a lot, another site like this is www.last.fm
They have a program that keeps track of what songs you listen to and recommends other similar music.
I'm pretty hooked.