OK.. I started this topic for dragonflammer. Our friend here has difficulties as psi starts to go out of control. I hope this topic can be useful for those who is interested in advancing psionics.
Shield is the name given to psi constructs enveloping the body of the psion. Once a certain level of psionic skill is attained, shielding becomes necessary. There are many different kinds of shield that is tailored for specific purpose, but they are basicaly giant psi balls.
More info on psipog:
http://www.psipog.net/show.php?id=38
For electrokinesis, you might want to pay a particular attention to the diffuse shield.