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Outside of iTunes content? OPlayer HD, and AVPlayerHD are probably the most recommended audio/video player apps on the forum. I have OPlayer, but rarely use it; because I rarely download and watch non-iTunes content on my iPad. What few movies I do watch on the iPad tend to be streaming content from Hulu or the likes.
For all round compatibility and accessibility, nPlayer is a stand out. I used to use OPlayerHD, but since they lost some of the audio codecs due to legal reasons, it was hit and miss on the audio front. nPlayer I my highly recommended media player app of choice!