Where can i find a chart with Nimh battery outputs.
On lipos we can find the 10C, 15C, ...
How about nimh...is there a rule we can follow...?
I mostly want to know the max amp output of AA, 2/3A and sub-C batteries.

Hey, I use GP NiMH cells primarily. I do have some packs that are unknown, but if you click on the type of cell you're using, you'll get a datasheet:

http://www.gpbatteries.com/html/techinfo/racing_car.asp

For example, the 370SCHR, which is what I *think* I'm using for my GP/Team Orion packs, indicates a continuous discharge current of 3.6A to 30A continuous.

That would make the discharge rating of that cell roughly 8.33C if you use "nominal" capacity to calculate that number...

Hmm, looking at those figures, no wonder even the wimpiest LiPo packs packs a helluva lot more punch than my NiMH...

Your best resource:

http://www.rcgroups.com/batteries-and-chargers-129/