Breaking up repositories

I recently imported my subversion repo with git-svn and I'm curious
what the best way to break up the monolithic repo (my many disparate
projects from my single svn repo) into individual git repos of their
own.

 I'm still trying to get a grasp on the considerable git toolbox and I
can't seem to find the functionality I'm describing, but I'm sure it
exists - I heard Linus talk about it in that Google talk on git!

Thanks,
Jason