what anime converter software do you use

[perrypig123]

i normally download my anime and sometimes convert some to put onto my ipod so i can watch it before i go to sleep xDD
i use videosoft video converter which is free xD and has a pre made ipod setting which is really usefull.. but it doesnt support .mkv files which is really annoying since i like downloading my anime in .mkv..
wat converters do you use?? if u do at all xD