As described in Chapter 7, the iTunes Store now sells movies, music videos, and TV shows. You can also import into iTunes your own home movies, downloaded movie trailers, and other videos, as long as the files have one of these file extensions at the end of their name: .mov, .m4v, or .mp4.
Other common video formats like .avi or Windows Media Video (.wmv) won't play in iTunes, but you can convert them with Apple's $30 QuickTime Pro software or any of the dozens of video-conversion programs floating around the Web. (If you're unsure whether a file's compatible, it's always worth trying to drag it into iTunes' main window and then choosing Advanced→"Create iPod or iPhone Version".)
Here are a few popular video-conversion tools:
PQ DVD to iPod Video Converter Suite. This $40 program for Windows converts TiVo recordings, DVD video, DiVX, Windows Media Video, RealMedia, and AVI files to the iPod's video format (www.pqdvd.com).
Videora iPod Converter. With this free software, you can gather up all those .avi and .mpg video clips stashed away on your PC and turn them into iPod video clips. Find it at www.videora.com.
ViddyUp! Mac OS X owners can convert their movies, even those in .avi and DiVx formats, with this $10 shareware program (www.splasm.com).
HandBrake. Now available in versions for Windows and Mac OS X, this easy-to-use bit of freeware converts DVD movies and other files for the iPod. You can get it at http://handbrake.fr.