So these ballasts are really cheap on eBay now, but I am struggling with how to control the dimmer. I like the idea of X10, but it's just another thing to get into. My soldering iron hasn't seen much action since college, but it would be cool to have a microcomputer controller that you could set and walk away from, since once you set the program, you probably aren't going to be making changes very often. I'm sort of surprised that someone hasn't done it already, but I haven't been able to find anything yet.
The ballasts are cheap enough (at least the two 39w ones), that I'll probably order a couple just to have around. I can always run it as a normal ballast until I find some time to figure out a way to get the dimmer function that I want, be it X10 or another solution.