Originally posted by another user
To use Maximizer, you have to install SIMBL and then put Mazimizer.bundle inside ~/Library/Application Support/SIMBL/Plugins (or in the same folder in /, if you want it globally available). I probably can’t help you get this installed; maybe read the SIMBL documentation if you get confused?
Note: Maximizer is currently in beta, and likely has compatibility issues with many applications. Some apps that work in full-screen perfectly without Maximizer might break with it, and some might not work at all. If you do have issues with Maximizer, I’d appreciate an email with the last few hundred lines from the Console app (find it with Spotlight) to help me debug the issue.
(Hopefully soon, I’ll be able to move Maximizer over to CydiaSubstrate, which will fix a number of issues. I’m not sure what the status is of CydiaSubstrate on the Mac (and Lion), but once it is available I’ll update Maximizer to use it.)