useful guide for convert mkv videos to MP4,AVI,WMV,MOV, etc

here is a good guide: What is MKV and how to convert MKV to MP4, AVI, WMV, MOV, MPG, 3GP, iPod, Zune, PSP etc?
I find it when I am confused with my mkv video. I think it is really useful. so post its original link here to share:
http://bestvideoconvertersoftware.blogspot.com/2009/03/what-is-mkv-and-how-to-convert-mkv-to.html (http://bestvideoconvertersoftware.blogspot.com/2009/03/what-is-mkv-and...w-to-co)
cheer

good information. thanks for share.