VLC (VideoLan) is a cross-platform universial media player. It supports a variety of different inputs, including DVD, VCD, MPEG, AVI, WMV, MP4, and MOV. It has full subtitle support, as well as built-in video filters. There are skins for VLC available at the developer website.
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VLC
My only gripe with VLC is its inability to Play real media files (RM,RMVB). Also there is no full screen playback controls. I am yet to find a Linux media Player as powerful like GOM player or KM player for windows. Mplayer with win32 codecs does the job. But somehow mplayer GUI does not go down well with me.