I like Riva and ATI. I need to try the latest speedfan, I hear they worked out the bugs.
I am using the latest version of SpeedFan too.
Works very well with Vista 64.
The Abit, uGuru utilities that came with my motherboard was crashing my system. Too bad to because the uGuru temp/fan monitor could also overclock the system, if it worked.
CoreTemp would not work for me at all.
As soon as it loaded I got a "driver would not load" warning from Windows.