IPad 2 and DLNA

Finally managed to get an iPad 2. Was waiting for a long time and did not go for the first generation iPad. But immediately fell in love with this toy, err, I mean device. Still looking for a good DLNA client for the iPad that also works fine with MKV and AVI files. Wanted to try AirPlay, but read in some reviews that it works fine for MOV and H.264, but has trouble with other video formats. So always open for any hints.