What is the max current draw GPIO pins can handle on FEZ Spider/Cerberus/Hydra, etc?
I’ve been searching and looking at schematics, but have not found the answer and am more of a software guy anyway, just need to know the basics. Thx!
40 mA typically
4mA not 40mA.
40mA was on old 5V micros. Anything new is under $10mA.
whoa, I better go easy on my hello-world GPIO LED then. 
Sounds like a transistor is defacto.
MaxO module lets you connect 32 LEDs with ease
You can use low current LEDs (2 mA) without a transistor:
Whoa is right.
@ Gus, this would be good data to add to the mainboard product/developer pages. Or even better, print it right on the mainboards. This question used to come up alot but not as often since Gadgeteer.