Interpolation Fun
Everyone likes interpolation. I generally prefer the precision of RoboFab's glyph math, but for a quick and dirty look at what some intermediate weights might look like, you can't beat the "Blend Fonts" command in FontLab. Usually I'll do some throw away middle weights with blend fonts. Then I'll do a more serious cut with glyph math. Of course, after all of the magic comes the hand tuning.
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Have you tried superpolating?
I have yet to superpolate with the app, but when it comes down to it, it's all just glyph math ;-) You can do all kinds of crazy cool stuff with it, including superpolation and more. Superpolator looks like a pretty slick little app, though.