I've seen quite a few posts around about running multiple distros but not sure they apply to using LVM (and without Windows). I'm using a machine that's about 3 years old. Setup:

 Intel Core i7 2.8GHz
 8GB Ram
 1TB SATA HDD

At this point, I'd like to install 12.10 and Mint 14, leaving the option open to install additional distros down the road.

I could be way off, but I'm thinking about creating at least 2 primary /boot partitions (1 for 12.10 and 1 for Mint) and another partition for LVM leaving room for additional /boot partitions. Then creating a VG and separate LVs for Ubuntu 12.10 and Linux Mint 14. I understand I can share partitions between the 2 installs, but I'm only using this for testing and I have tons of space to play with. LVM seemed logical considering I may want to install and test additional distros. I guess I could share the /swap partition across the board without problems, right?

I'm unclear about GRUB2. How do I handle the bootloader situation? Install 12.10 and get it running then make changes to grub.cfg after installing Mint? And do I not install GRUB for Mint or do I install it in a different location? Any guidance would be appreciated.