CD Burner XP Pro for data and audio, ImgBurn for Image files. ImgBurn also does data, but I don't like it's interface for burning data files (only if it's a very simple data burn such as a VIDEO_TS DVD Video folder). Both are freeware, CD Burner XP Pro hasn't been updated for awhile but it's still a good program and there's a newer beta version if you'd like to try it out.
Another option, if money is one of the reasons you're looking into alternatives, would be a Nero Suite/Nero Express version. It comes free with many burners, OEM included, or you can buy a disc online for about $5.