this is a great thread....
When my first dd was born, I totally lost myself for awhile. It wasn't until she was around 15 mos. old or so that I realized, "hey, where did I go?" It was then that I asked a friend and my SIL to go out for dinner once a week or so. We usually get together every other week lately, but its nice. I get to sit and eat without being interrupted a million times, have a drink, and gossip/chat with my friends.
Also, I try to get my hair cut every few months, maybe with some hi-lights put in it. I always feel better about myself with a new haircut.
Lately, I've been trying to get up early in the morning and squeeze in a workout. In our basement, we have a bike and elliptical, so I'll try to get a workout in, and watch the morning news, which I love. The time goes quickly, and I forget I'm even exercising(which is good, because I don't really like to exercise

)
Last weekend a friend of mine called me up inviting me to go outlet shopping with her on Sunday. I asked dh, and he gave me the go-ahead to go. I left at 930am and didn't get home until 530pm. I felt awesome. So rejuvinated and refreshed.
I have to add, that while sometimes I feel a bit guilty for needing "me" time, I remind myself that if I'm properly nourished as a human, I can offer more to my children. My husband is awesome, in that anytime I tell him I need some free time, he doesn't bat an eye. So that helps, too, his support. He plays soccer on a league on Friday nights, so that's his outlet, too.