My idea of a swag kit consists of an SFD08 shirt, some SFD08 stickers, and LiveCDs/DVDs of major Linux distributions (Fedora, Ubuntu, Slackware, etc.).
Since a Fedora LiveUSB station won’t be that hard to setup, I’ll be keeping that in mind for those attendees who may happen to have spare USB space.
For the shirt, I’m thinking of using Jayme Ayres’ design for projetofedora.org. It’s GPL-licensed so we can make revisions to it like accommodating other sponsors at the back. It also didn’t hurt that the design is clean and BLUE.