The mod_perl Developer Cookbook has a chapter (2, if memory serves me correctly) on configuration and I the sample configs are available for download from the web site in the sample code tarball.

Update: Oop, I just looked more closely at what they've got available for download and it's not a whole lot from that chapter. The dead tree does have a good bit of discussion on configuration in chapter 2, although I'm not sure it's not somewhat dated with respect to Apache 2 so if you don't already have access to a copy it might not be worth it (then again if you're still using mod_perl 1 it's a very good reference).