Delicious Bookmarks
Delicious is more useful for finding new and interesting links than it is for finding your own old bookmarks.
I was looking for a link the other day that I was positive I bookmarked on Delicious a few months back, but for the life of me, I could not find it. I thought I tagged it with a certain word, but no. I couldn't find it.
Bookmarks don't work for me at all, no matter what the implementation. Maybe the answer is to
blog your bookmarks instead (like Cory Doctorow). That way you have the link and all the annotation you care to add. And all easily searchable.