Well, if you jailbreak, you can get a ported version of the popular VLC media player which may or may not be useful for you. There are apps to stream media over your network such as airvideo.
If you want to jailbreak, go to this site on your ipad: http://www.jailbreakme.com
If you want to jailbreak, go to this site on your ipad: http://www.jailbreakme.com
