Yahoo has released an upgraded My Web search. My Web 2.0 allows Yahoo users to use the regular Yahoo search and save their favorite pages. When saving, Yahoo allows you to add tags to the page. Once saved, you can then search My Web and find pages that you tagged.
It’s also integrated with Yahoo 360 so you can connect with your friends and the pages that they saved in their My Web will be connected to yours.
I have yet to figure out how to search though everyone’s tags and saved pages. There is an “Everyone’s Tags” area, however I don’t see an ability to search just that. Maybe I just need to explore it a little more.