Hahah, that is so tagged for tomorrow morning when they deliver it. Personally I'm going to reinstall OS X, drop *some* of the printer drivers, a few of the more obscure language packs [I travel, so I still need a few] and probably some of the trial/included software I don't need. Didn't do it with my iMac but I can see myself needing the extra space.
Other than that, I've been saving this background for it; I have a bunch of very high quality 1440x900 photographs I trawled the web for, but this one I wanted to save for the MBP.