I'm running Ubuntu 32-Bit on my 64-bit laptop. Too many problems getting Flash, etc to work on 64 bit (geared more towards servers/work computers) and since the most number crunch intensive thing I use is a spreadsheet, I don't see a difference in performance.
Version 7.10, Kernel 2.26.22-14
1GB Ram
Twin-CPU AMD 64. Clock speed escapes me.
Vista brings this thing to its knees.
I have had a mother trying to get my printer to work properly, (odd model Canon) but other than that it was working out of the box.
The only driver I had to make/compile was my AirCard for wirelless (CELL) internet.