We aren't running Python 3 yet -- we are using Python 2.6.

The most impressive things that might push us to upgrade are the new VMs like unladen swallow or PyPy, assuming they don't get backported support for 2.7ish style python.

But right now, most libraries are made for 2.x only, and there isn't yet a large enough performance or memory use gap to force us to take the porting hit.