http://ogmtoavi.sourceforge.net/
Seems to be a simple automated app and you can do batch processing...but it's from 2006 so I don't know how well it fares with more modern codecs or containers. Theoretically if it just hooks into whatever codecs you have and automates the conversion it should work fine.
There are definitely more professional apps out there that will do the conversion but I don't know any off the top of my head as I've never done this before.
edit: okay the reviews are not too good:
http://sourceforge.net/projects/ogmtoavi/reviews/