KalemSoft Player. I have the version for my Pre. It works amazingly well and streams very quickly over wifi. Cost me 6 bucks after the trial. Totally worth it... You can download a trial from their website. Google it. Pretty sure it's just kalemsoft.com. There is also a media player on Preware. It should be one of the most recent additions. It supposedly plays every type of file, obviously not over wifi but with 32gb (or 16) you should be able to get a good amount of movies on there, no problem. It's free too, I think.