If any of you have wondered how to convert movies in the .mkv format so you can use them on your ipod and/or appleTV – the link below is a gem.
Basically, get Quicktime Pro, and install Perian (free) Perian gives you the codecs you need to open the mkv in quicktime.
Open the .mkv file in quicktime pro, then wait for it to load (Perian takes a while). Once it is loaded, you can export it to the format of your liking…I prefer h.264.
enjoy!