You mean the other psionics book.  It's an undersupported system.<br/><br/>The Mind's Eye (big web supplement from Wizards) has a lot of psionic material, and some incidental books have some.  Also, a lot of arcane classes can easily be retooled to psionic and some (like Mindbender) have that listed in their adaptations.<br/><br/>Dragonfire Adept is a Warlock-like (just dragonier) base class from Dragon Magic.  It also has some psionic material (and some material for pretty much everything, including an extra vestige and some incarnum stuff).