Use StreamToMe on your iPhone, iPod Touch or iPad to play *video*, *music* and *photo* files streamed over WiFi or 3G from your Mac or Windows PC. No prior conversion or syncing required (huge number of formats supported without conversion) just tap the file and it plays. Using TV out cables (iPhone4 or newer) or an Apple TV (with iPhone3Gs or newer), StreamToMe can play through your TV, turning your iPhone/iPod/iPad plus your Mac/PC into a home media center for all your files.
Price: $2.99
Platform: iPad and iPhone
More info: http://itunes.apple.com/us/app/streamtome/id325327899?mt=8