I like to chiffonade collard greens and sauté them with garlic. Kind of like this:
A slightly more dressed up version:
It's quick and really tasty (I actually like collards like this more than I do braised, though collards braised with chorizo are amazing, too).
Here's another quick method:
Here's a bacon-y one:
Brown butter collards:
Collards also make really good slaw/raw salad.