Jordan Rudess has a site where he teaches some good exercises, it is mainly for those who pay for it, but there are a few previews available for those of us who doesn't pay.
I recently found a video tutorial with a lot of great hints and exercises, that too by Jordan Rudess. It's split up into 6 parts on youtube, here's the first part
I'm pretty sure it will give you some help, if you have time to watch all parts
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