I have a similar issue - first it was on my right leg and now a couple months later its on my left leg. A combination of hill and speed workouts seemed to bring it on for me. If it hurts too bad, take a few rest days. Mine eventually just went away after 2-4 weeks. I think it helps to warm up and stretch properly before runs, ESPECIALLY speed workouts or runs that are harder on your body. Also, you may want to ice it and/or soak your legs in cold cold water for 5-10 minutes after you're done running. A foam roller may also help.
Keep in mind, if you choose to run like this, listen to your body very carefully. If they are true shin splints, you are much more prone to stress fractures until they heal up all the way.
Sweet! I love my Lunas. Just a word of advice - I wouldn't recommend running a race in them so soon. It has taken me 2+ months to figure out the best way to tie them for my feet. I had lots of issues with them loosening up. Chances are you'll have to retie a few times during your first few runs with them. After you get the hang of tying them and how tight to tie them, I think you'll find them to be very pleasurable to run in.
I just recently blistered my feet up fairly badly in a pair of classics. Not my first time and probably won't be my last either, at least until my feet get acclimated to hot pavement. The worse it did was force me to take a couple days off from running though. For some reason the thinner sole'd vibrams seem to transfer the heat too well. I haven't noticed heat problems in runamocs, luna huaraches, or various TP shoes.
You should come out to Umstead tonight... NCRC puts on a weekly social run every Thursday night, people of all paces are welcome. You don't have to be a member to come either. In fact, a lot of people who come regularly aren't members. You can get more info here if you are interested, just click on the first link under "Upcoming Events" on the homepage: http://www.ncroadrunners.org/
It would be nice to see another minimalist enthusiast out there... I'm the only one, haha!