Do Anh has Video Downloader & Media Player Pro++ (iTunes Link) for the iPhone, iPod Touch, and iPad in the iTunes App Store for FREE (regularly $5.99) for a limited time.

Media Player can download video from almost video sites such as: youtube.com, dailymotion.com, myspace.com, metacafe.com, videobash.com, ted.com…

Media Player can play almost any video file formats such as MP4,MOV,AVI, MKV, WMV…

All you need to do is download and/or copy files to Media Player app via built-in web browser, USB or via WiFi then play it and even you can play a video file from your MAC directly without copying.