Converters: Video and Audiobook
Handbrake - (Windows/Mac/Linux): The cross-platform freeware application HandBrake is the go-to application when you want to rip a DVD for your iPod or iPhone (or PSP or PS3 or AppleTV...). Just pop in your DVD, pick what you want for your iPod, and start ripping.
Link -
http://handbrake.m0k.org/
Videora - (Windows): If you've got a video file on your computer that your iPod doesn't support, fear not. Just plug it into Videora and let it do the heavy lifting for you. It even transcodes YouTube videos—all you need to do is give it the URL.
Link -
http://www.videora.com/en-us/Converter/iPod/
iSquint - (Mac): Make any video iPod-compatible with iSquint. Just drag the videos you want to convert into the iSquint queue, choose the encoding quality (which will also determine file size and time required to encode), and let it rip. You can even tell iSquint to automatically add the video to your iTunes library once it's done encoding
Link -
http://www.isquint.org/
iPodifier - (Windows): iPodifier transcodes files just like Videora and iSquint, but if you're a frequent video downloader or you're rolling your own DVR, iPodifier can be set to monitor a folder for new videos—like your BitTorrent downloads folder, for example—and automatically transcode them for your iPod.
Link -
http://ipodifier.com/download.html
MP3 to iPod Audio Book Converter - (Windows): If you love a good audiobook but your book isn't in the right format for your iPod, this handy little app will convert your MP3s to the iPod audiobook format (M4B) so you get all of the audiobook features like playback speed adjustment and "start from last position" functionality without the tedium of doing it yourself.
Link -
http://www.freeipodsoftware.com./index.php