AV Player HD
Utilizes swipe gestures, can play avi, mkv, just about any file format out there, can delete files once viewed (no need to hook up to a computer), can wirelessly transfer files if you wish, can adjust and utilize subtitles, can project onto tv in hd format, can adjust aspect ratios (I.e. 4:3, 16:9, etc...)
Best app to watch videos in any format, bar none!