As long time readers of this blog knows, I started a project to clone Supplement III since I am fond of psionics. I have reached the end of the road of that project, and it wont materialize as intended.
The fact is that when you delve deeper into Supplement III, you realize that this some of the worst written rules in the D&D canon. The editing is abysmal and the rules contradictory and clunky.
There are two ways to approach this, one is to rewrite it to conserve the feel or the other is to try to untangle the mess and present it the way it was intended. I had intended to do the latter, but I found it was way harder than expected. Partly I guess that comes from loosing all respect for the original after spending some time with it. I also felt the tug to just write my own, but then it would not be a clone.
But, after all those negative vibes I am happy to say that someone have managed to create a set of rules that have that old school feeling, preserve thrust of the original and are clear and lucidly presented. I direct you to the Retroroleplaying blog by Randall Stukey. Randall have written the very cool Microlite 74 and Microlite 75 rules, and those contain a very workable and excellently presented rules for psionics, in the spirit and style of Supplement III.
My project floundered, but at least someone managed to present something instead. My hat off to Randall for his great work.