Not an official answer, but I would imagine they would affect Incorporeal the same way normal spells do, seeing as there is the whole "what effects magic is generally assumed to affect psionics" thing going on. Detect Magic works against Psionics, Power Resistance can also be Spell Resistance.
Also, there is this feat, Ectoplasmic Power.
Benefit: To use this feat, you must expend your psionic focus. An ectoplasmic power has full effect against incorporeal or ethereal creatures. Using this feat does not increase the power point cost of the power.