There are an odd number of Arduino compatible 3.3V devices out there... just need to remember what's what and make sure you convert your logic to compensate.
Good call on that Steve. I've got a 3.3V Adafruit Trinket that I program with the Arduino IDE
Some of those 3.3v boards also have a 5v regulator on them. You can't drive a 5v device directly, but you can use your 3.3v to drive a transistor to power 5v devices. I agree, don't mess with 3.3v boards unless you have to, there is too much more to think about when interfacing it.