Alrighty, this is my first post here, and since this seems to be the place (judging by the board description) to suggest improvements, why not this simple little widget?
I can't claim responsibility for the idea, having seen it first at xkcd... anyway, I found that it was fun to just keep clicking the 'random comic' button and see what pops up. I guess you could accomplish the same effect by going to the archives page and scrolling/clicking randomly, but that way feels kinda clunky...
It wouldn't be too hard either. Although the comic URLs are organized into dates and not numbers (a la xkcd), I could make a quick program in Python that would allow you to easily select random dates (assuming the posting of all of the comics follows a set pattern - of course, it would be easier if you simply had a database of all the comic dates).
P.S. - Apologies if this is a re-post, but I couldn't spot a search function and my (rather perfunctory) scan of the front page didn't yield anything similar.