For those wondering why SL defaults to 32-bit mode, over on the Apple forums some senior posters were saying that the only real benefit would be to those who have >= 8GB of ram installed, and the reason they chose to default to 32-bit was to ensure compatibility with drivers (64 bit requires entirely new drivers).
Another thing that was mentioned was that even in 32-bit mode, you can run applications in 64-bit mode, so there doesn't seem like a lot of need to run in 64 bit. Here's the thread:
http://discussions.apple.com/thread.jspa?threadID=2130976&start=0&tstart=0
Apparently it doesn't matter to me because I have a 32-bit EFI, so I'll be unable to run the 64bit kernel.
As I posted above, I'm generally happy with SL.
But out of interest, in layman's terms, what is the deal with 64bit then?
It was touted as one of the big gains of SL, yet that suggests its effectively meaningless to a big proportion of Mac users?