As I have just said I use Linux on my R500. Why Linux over Vista?
One great asset of Linux compared to Vista IMHO, is the more efficient use of RAM. Indeed, under Kubuntu Feisty, the starting memory usage is around 180 Mb, out of my 1000. With Firefox open (a few tabs and a few extensions), Thunderbird and emacs it rises to 310, and with a 760 pages pdf, to 360 Mb. It means that, indeed, under Linux, 512 Mb are quite enough for a reasonable use. Moreover, note that there are lighter desktops than KDE, and Firefox and Thunderbird are both memory hogs, which means that using Linux on old computers is really a good idea. With my R500, Linux is a lot faster than Vista.
Moreover, Vista is just XP with a new GUI (Aero) basically, and XP is quite an old OS. It does not stand the comparison with Linux. Even the 3D Aero is really laughable compared to the real 3D effects one can get with Compiz Fusion under Linux. So, even though