A couple of weeks ago I installed GoodPlayer for iOS an app for watching just about any type of video content on the iPad. It supports virtual any format of video and works as a UPNP client making it a great app to have in your collection.
The latest update (version 5.3) adds Retina display support, improved music playback and improved hardware decoding.
The app costs £1.99 from iTunes
What’s New in Version 5.3
1 Retina Display support for video output added, this improved the video quality for iPhone 4, iPhone 4S and new iPad
2 Video quality improved. This improvement is for all supported iOS devices
3 Music playback improved
4 Finnish localization improved, thanks to Patrik again
5 FTP client supports passive and active mode selection, the default is passive mode. Turn off the “Passive Mode”, it becomes active mode
6 FTP client adds Shift-JIS encoding
7 Hardware Decoding improved
8 AirPlay support improved