FWIW Department:

Apple has begun fixing the major problems that have cropped up in the first generation of their new intel-based Mac laptops.

http://www.dailytech.com/article.aspx?newsid=1584

This update addresses the really severe overheating problem that, in some cases, made the keyboards too hot to touch.

An update to OS X is due out "soon" that will address speed problems some owners are having when they did not purchase the extra 1 Gig update (2 Gig total) to memory. The 2 Gig configuration seems to work well. Programs specifically written for "Universal format" seem to run fine in 1 Gig. Adobe products and MS Office are two of the "biggies" that have not yet announced the time scales for their iuniversal format versions.

http://www.dailytech.com/article.aspx?newsid=1592

I've said it before, I'll say it again: first generation of anything is only for the very brave!