I needed to know how to do something with my particular arrangement.
My configuration is i have a new Imac, and I have alot of movies in avi. format that I want to burn on a DVD and be able to play on my PS3 as that is all I use to watch movies. And I doubt that I can just burn that avi to a DVD and boom it works. So I need to know what I need to convert them to, and what is the best program to convert them (doesn't have to be free software either, just the best because it will be watched on a 61" tv, so I need quality to be awesome cause otherwise it will stretch and distort).
And how to burn them with what program for them to work on my PS3.
Thanks for any help.

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You may refer to this step by step guide, it's about how to burn movie to DVD on mac, it works pretty well for me.

mac-dvd.com/mac-guide/how-to-convert-video-to-dvd-on-mac.html