Okay, so I made it through the first round of accessory buying. I got the Planet Bike "Full" ATB fenders (ASIN B000RYBGKM), which needed a little bit of bending on the front supports to fit, but do a great job of keeping the splashes off of me. I got the M-Wave "Alloy Bicycle Carrier Rack" (ASIN B001NGF4W4) which fit great even though the instructions were printed in German, and the M-Wave Double Day Tripper Panniers (ASIN B001NGD4UI) which I think look a little bit small, but have enough room for me to stuff my laptop backpack in one and my son's backpack for camp in the other. And here's a picture of me standing next to my bike, taken with a poor quality cameraphone

I'm still looking at trekking bars, which seem pretty awesome, and after my wet ride in this morning I'm thinking about clips for the pedals.