[3.5] Non-power uses of power points?

[Nero24200]

I believe you may have made a mistake, most powers never really become useless, they scale in a way spells don't.

Pretty much, and it's one of the elements of the Psionic System that I like. The only way powers become useless with level is if you take the handful of powers that aren't augmentable and don't really work at high levels (though I cannot think of any such power off the top of my head which falls into two catagories).

To my knowledge, the only abilities which spend power points without the use of powers are the Elan Racial Features, A Deep Crystal Weapon and one of the feats from Tome of Battle.