After having a gazillion del.icio.us bookmarks, loads of bookmarks in various browsers on various computers (I use a lot of both), and not being able to find stuff I'd found before, I got fed up.
I would search for the same reference work multiple times. I could always picture the site/page in my mind, but you know that doesn't always translate into being able to find it when you need it.
So with no furthur rambling, this site is simply my repository of what I use on a daily basis. If it helps you too, so be it.