Sautee or boil it, then mix with a spiced honey mustard. I mix mustard, mayo, honey, curry, garlic, paprika, salt, cayenne and/or black pepper. Optional: Top with fresh cilantro and chopped cashews. This is my favorite cauliflower dish. I replicated it from the cauliflower that Houston's used to serve (until they changed theirs to something horrible).
Cauliflower and Caramelized Onion Tart
This is a lighter version of a Bon Appetit recipe. You can find the original on epicurious.
Mark Bittman's Pasta With Cauliflower
Cauliflower puree instead of potato mash?
Roasted with a little ground oriander, garlic ,and olive oil?
Maybe curried in a soup, with coconut milk (frankly, I'm sick of this combo after once or twice a season...)?
I read somewhere you can steam cauliflower, then whiz in the food processor until the texture of rice, and use it instead of a rice side.