I have an early 2008 (White) Macbook that I did a clean install of Lion on. One thing I noticed when looking around was in the System Profiler, if I click on software it says "64-bit kernel extensions: No". Now I thought Lion only ran in 64bit, and when I boot up, it tells me my Apple USB modem can't be used. I was under the impression that was because the kernel driver for the modem was 32bit only - but System profiler says that 64-bit extensions aren't enabled... I'm a little confused.