There are tons of apps that convert movies on the fly and stream to the ios. They are nice, and it's good we have that option. But they have some disadvantages. For once they can use the computer CPU to max, and sometimes a slow CPU laptop is not enough. And if you wanna seek and skip back a few seconds in the movie, you have to wait ...and wait. While AirPlayer is able to stream movies like mpg or avi to your ipad without conversion. It won't use the computer processor and more importantly you can seek and fast forward instantly without wait for re-conversion. The seek time is similar to native player with movies loaded on the ipad. And you can choose from 3 plugins : FFmpeg, default and QuickTime. With the quicktime plugin you will be able to play mp4 files with the native hardware. Are there more apps like the AirPlayer ?