flax seed & water goop. I used to use ener-g but thought I might go with something that would also add fiber & some omegas. It works very well in everything I've tried - cookies, cakes, pancakes, waffles, muffins, cornbread, etc... and I never taste the flax.
I've never tried the tofu trick - are you guys using water-pack or silken tofu? soft? firm? extra firm?