These files include the X and MS Windows drivers. The Macintosh driver is distributed separately. Use Mesa 1.2.3 until the driver is updated. If you find a bug in Mesa you should first check if there's a more recent version or a patch on the ftp site. Bug reports are welcome but please send as much information as possible.
Bug fixes are even more welcome.
If you'd like to help with something send me a message. I'll give advice and point you to other people interested in doing similar work. Documentation Since the OpenGL API is used, OpenGL documentation can serve as the documentation for Mesa's core functions. Mesa FAQ Mesa User's Guide Mesa Implementation Notes Mailing list Pedro Vasquez has setup the Mesa mailing list. If you think you've found a bug in Mesa I'd certainly like to hear about it.