Thought I ought to post something as I've not posted anything yet this month, not good!
Anyway, I thought I would chip in on the topic of Social Bookmarking. The favourite of many (including .net magazine, who mention it at the expense of all others) is del.ico.us. Now del.ico.us isn't bad, and I like that you don't have to log in to see a lot of links, and I've found other handy links through the tagging system.
However there are annoyances, my main one being that you can't have (at least from what I've seen) a multi-word tag. Therefore items like Crystal Palace and Fantasy Baseball aren't ideal for del.icio.us.
My personal preference is for a site called Furl. Furl supports multi-word tagging, private bookmarks and also keeps a cached version of a page you save (which I really liked when ESPN used to make Bill Simmons' archive available only to site subscribers). Therefore it is ideal for individual articles, in case they should move or be deleted.
For some reason Furl doesn't seem to like IE6 (at least at work) but on the whole I prefer it, especially as I generally use Firefox.
So in summary, del.icio.us for main site links, Furl for individual articles.