Well, I have an AM2 X2 4600+ (2.4GHz) running at 2.6Ghz. So, it is basically running as a AM2 X2 5000+.
I have a Zalman cooler in place of the original CPU heat sink and my idle temps are 25 degrees and load are around 32 degrees. Plus the voltage of the CPU is at 1.35V, which is considered stock.
So, is overclocking worth it? Hell yeah, if your temps are cool and your volts are not too above the recommended...I checked AMD's site, and I found my processor can handle temperatures up to 60-70 degrees. The way I'm going now, I expect my system to last 10+ years...
8)