I came across this very cool offer the other day, for a piece of software called iSkysoft iPhone Video Converter, which allows you to convert most video format’s into videos specifically for the iPhone. The software scales the video’s to the correct size, and then allows you to add them to iTunes, which can then be synced to your iPhone or iPad
From the iSkysoft site:
iSkysoft iPhone Video Converter for Mac converts all popular video and audio formats such as AVI, MPEG, MOV, OGG, WAV to iPhone, iPhone 3G, iPhone 3GS, and iPhone 4 supported formats including MP4, MP3, etc. This Mac iPhone Video Converter software provides a series of practical settings such as video crop, file trim, video brightness, contrast and saturation, and merging multiple files into one outputfile.
The free offer is only valid till the 26th of July, and they will send you a key to use the full functionality. It usually costs $29
To download the software you can go to the iSkySoft site – http://www.iskysoft.com/iphone-video-converter-mac.html for Mac’s or http://www.iskysoft.com/iphone-movie-converter-windows.html