Packet Video have updated Twonky Beam for iOS. The update includes beaming media from your phone or a server to an Apple TV as well as bug fixes. If your looking for a DNLA app for iOS this is work looking at.
The app is free from iTunes
What’s New in Version 3.1.0
• Fixed a crash on launch reported by some users.
• Browse, beam, or play the media on your mobile device or on another media server in your home network
• Share media on your mobile device with other devices in your home network
• Browse and beam media contained in RSS feeds
• Integrated Beaming to Apple TV
• Support for Beaming to U-verse TV receivers