If you need a way to PXE boot Linux Mint, take a look at http://sf.net/projects/oneclickkick. I'm a Linux Mint user and I have been missing this feature for quite some time.
A short summary:
A web based GUI for managing clients for PXE boot clients with support of Kickstart scripts. Client install in one click. This is a generic framework created to work with any PXE bootable image.
This now includes Linux Mint for LIVE boot via NFS. I'm working on making an kickstart/preseed installation of Linux Mint as well.
Anyone who would like to participate is welcome!