I'm a diehard fan of the 2E Complete Psionics Handbook and The Will & The Way psionics supplement. The system had its flaws and need more work, but it FELT like psionics, instead of just warmed over magic. I like the psionic feats in 3E, but there was too much similarity to magic. I wanted to see tangents, devotions, and sciences, not psionic spells. D&D or otherwise, what psionics rules do you like? What do you want to see in a psionics system?