Oil Can Henry's is ok when you really, really can't do it yourself. You'll pay a premium over doing it yourself, and you can't be picky about your oil. I had them do a coolant flush for me, and my parents take all their cars there.
Stay away from Jiffy Lube, though. Like Jennifer, they left the oil plug loose on my parent's old van and the engine slowly bled until it seized. Sucked for them.