Are there any support tools like coderush or resharper for F#?
Not yet, as far as I know. I was also looking for something similar to no success. I suspect as soon as F# hits VS2010 as its integral part, or even a bit earlier, such tools will eventually emerge.
As far as ReSharper is concerned, you may want to drop JetBrains a quick email, it would be interesting to know whether these guys have any plans regarding F#.