No, I don't think so.
The Xiph component will let you open ogg audio files, but I've never gotten it to work properly with ogm movie files (it's not really supposed to, as far as I know).
mkv support is apparently planned for future versions of Perian, but the current version doesn't have it. Keep an eye out for updates.
.mkv is now supported by perian. I know this post is old but it will help newer searches for those looking.
.ogm on the other hand i can't say for sure they don't say at their sight that it's supported though.