I tend to limp with them if there are several limpers ahead of me. I am willing to call to see the flop if I am getting around 4:1, which happens a lot at 4NL.
I've also raised with them if there's no action before me. Sometimes though they look better than they really are. I don't play them very well myself. One hand where I spewed away my stack today was:
I raised with 910 of clubs. I had one caller, BB.
Flop is 267 with two clubs. BB leads out with a weak bet. I raise him, he min. raises me. At this point, I should have just called as the 3 bet pretty much means he might have a set and is not folding. Instead I think I have a load of outs and shoved. He flips over AA (an overpair is something I didn't put him on) and I couldn't catch my 12 outs or a possible runner runner 9 10. Gave the coins away.