I'm still running an fx53, built my computer near the end of 04 I think. It's actually doing okay. I've been busy with school work so I haven't started up any CPU intensive games recently (TF2 runs fine but that's more gpu limited, using a 6800 ultra). I'll be building a new rig when I graduate, probably with a 9450.
Interestingly the components that have started to die in my rig are the monitor (2001fp, artifact band appeared 3 months ago), graphics card (power connector complaint, could be PSU related), and my motherboard (MSI K8N neo2 plat, ethernet ports work intermittently).