Re: Effects Loop 101
Typically you would put wah, distortion in front of the amp's input. Compressor as well...conversely, modulation and time-based effects (delay, reverb) are "best" in the loop. This is generally how I like my setup as well. Anything that is volume oriented (wah being a type of EQ) or dynamically triggered (auto-wah, envelope filter) goes between guitar and amp. The others in the loop.
Then again, it's all about what works best to find your sound.