Gamestop is offering a trade-in special to upgrade to the Xbox slim. A great deal if you have the original consoles (especially the ones without HDMI), not so much if you have one of the newer elite models. You can see the website for details.
I might go that route if Amazon doesn't get on the ball and ship mine to me, They kept bumping the in stock day back every day since Thursday, now it says they are in stock but it still hasn't shipped. WTF?!?
I know I'm just being impatient since I pre-ordered it on the 15th but still...