The only computer I have is a three year old laptop, I use it for everything. Games, homework, reports, cs:s, everything...
I use a cord-mouse, and a wireless keyboard. I also use Omega Drivers, because they're the only drivers I could find for my 9600 mobility.
When I play source I average about 20 fps, depending on the map and how many people are playing. So, it's about time I upgrade.