As far as I know, it benefits men and women the same, but some women don't like it because it makes you retain water and weigh more. I am thinking of getting some because it is supposed to give you more energy to perform better during lifting. There are a couple other ladies who I noticed in their logs also used creatine, but I can't remember who at the moment.
MUSCLE WITH ATTITUDE - Creatine For Women
Here's an article about it.