Yahoo cuts Delicious...
No word on what it specifically means for existing accounts, but it might be a good time to move to Diigo...
I have a wiki that I add the links to (when they are content related, i.e. math, language arts, etc.), I also created a livebinder for links I use with my students (K-5). Livebinder has a bookmarklet tool that makes it easy to add lihks right to an existing binder OR start a new binder. I highly recommend it.
I also like Livebinders Debra and Wikis.
For my main bookmarking tool I do like Diigo becuase I have all my bookmarks there, all tagged. Diigo also allows me to share any groups of links through lists or webslides.
I suspect Diigo has a few new customers today! As Christopher says Delicious is going. It is possible to move all Delicious bookmarks to Diigo.