Windows only:

Convert nearly any video file to an iPod-friendly format with Videora iPod Converter.

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The latest version (2.05) features an updated interface and loads of improvements, including support for 640×480 H.264 video and an auto-resize feature that selects the best possible resolution while maintaining the correct aspect ratio.

Pair it with the Videora video-download program (basically a specialized front end for BitTorrent) and you can automatically retrieve and convert TV shows and movies.

However, like its predecessor, Videora iPod Converter is an indispensable tool for iPod users. It’s free and works wherever Windows does.