Here's another great little free program, G*Power 3. It does many of the common anova power analyses but also includes manova and Hotelling's T-squared. Throw in multiple regression and you have a pretty useful package.
There are versions for both windows and macs. This in itself is pretty unusual.
The authors are Franz Faul, Edgar Erdfelder and Axel Buchner. They all appear to be psychologists but that is no reason to avoid G*Power. I highly recommend it. The website is at Heinrich Heine University Dusseldorf and here is the link.
pbe
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