Ok, here's a quick description of my system right now.

OS____Windows XP Home SP3
CPU___AMD Athlon X2 3800+ / 2.8GHz
HSF___Arctic Cooling Freezer 64 Pro
Mobo__GIGABYTE GA-M61P-S3
GPU___GeForce 7600GT, 256MB GDDR3
RAM___A-DATA Extreme, 2GB, DDR2 800 / 4-4-4-12
PSU___FSP Group 450W
HDD___Western Digital Caviar 250GB
Case__Antec Nine Hundred

And here's some CPU-Z shots.

Right now the processor rests at the speeds you're seeing and according to EVEREST right now...

Mobo - 43 C
CPU - 24 ~ 27 C (on average)
Core 1 - 34 C
Core 2 - 38 C
MCP - 54 C

This is doing light stuff like IM, browsing, typing this thread up, etc. Basically idling. The 120 mm fans (the two in the front and one in the back) at medium speed, and the large fan on top is at high.

I was thinking of trying to go even further, but when I ran Prime95 a few minutes ago (both cores maxed out 100%, was using the max temps torture test), Windows froze. Didn't bluescreen, just froze. So since then I just rebooted, tweaked some of the EasyTune settings so the CPU HSF runs faster and I turned the 120mm fans all from Low to Medium; large fan was already at High I think. This is what the temps looked like before this all happened (Idle).

So I suppose I have a respectable overclock already, but the question is, do I dare go further?

I don't see why not, as long as you can take it higher and keep it stable there shouldn't be anything wrong with that. However, that is already a pretty respectable OC.