http://www.google.com/products?q=iPod+Touch - To Purchase Online - Recommend 3rd Generation 32GB
We recommend at minimum that our Ayurveda students purchase the 3rd Generation 32GB iPod Touch ($269 as of May 5, 2010), which holds up to 40 hours of Ayurveda .MP4 videos. (Video capacity is based on H.264 1.5-Mbps video at 640-by-480 resolution combined with 128-Kbps audio; actual capacity varies by content. Source: http://support.apple.com/specs/#ipodtouch)
To this end, all of our Ayurveda instructional videos are available in the highly bandwidth efficient open standard Apple compatible .MP4 H.264 video format. These video files are half the size the traditional higher resolution .MPG MPEG2 files. Do do this you must use Apple iTunes and Quicktime (http://www.apple.com/itunes/download).
Be sure you have downloaded and installed the VLC Media Player for MP3-WMA audio and for MPG-FLV-WMV videos. It is the simplest and best Multimedia Player and should be used instead of Windows Media Player.
If you want to listen to the Ayurveda audios and videos using your iPhone - iPod - iPad you must use Apple iTunes and Quicktime (http://www.apple.com/itunes/download). In this case, for iTunes users, you should download the video files that have the .MP4 filename extension (H.264 - 640×480 resolution, 1008kbps, 25fps files) and the audio files that have the .AAC filename extension rather than the .MP3 or .WMA extension.