Before I began skating I was a ballerina on a pre-professional track, so I think ballet is an awesome thing to take "on the side" of skating....Or anything reslly! It will not only improve your flexibility, grace and coordination but also your over poise and presence, if that makes sense :-P you will become more aware of where each part of your body is, how you are holding it, etc. You will find improvement in your lines which will translate to skating very well you learn how to achieve the most out of leg extension and port de bras (how you hold your arms). I could see how it could help your jumps, as you when jumping in ballet you learn to utilize the most out of your knee bends and such. Currently I do an adult class once a week (I am 19, I quit dancing pre-professionally and competing three years ago and now I just do it for fun) and I love the adult class I go to! However, there are some "ballet habits" if you will that will not translate to skating...spotting, for example...I still have a hard time not spotting in my spins when skating, but I find spotting helpful when I am working on twizzles.
Anyways, that's just two cents coming from an avid ballerina! Diane, I will shoot you a message about the adult class I go to...you may be interested in it as it has more gals and the teacher is wonderful.