UI Experts and Pseudo-Experts: Help! Oct 22, 2008

I've started work on the next iteration of ProCon, the online event registration system used by Festival of the LARPs.  One of the areas we improved dramatically for last year was the schedules page.  It's not too shabby looking right now:

However, it's hard to tell at a glance which games have openings, and how many.  I'd like to make this easier to use, as well as easier on the eyes.  I've come up with a mockup:

(Note: the numbers in the mockup are basically the same as the numbers in the above image.  Just to show how neutral slots would look, I added 9 neutral slots to "Only Mighty Guests" for the mockup, 2 of which are taken.)

I can't help but feel like this is still lacking something visually, but I'm not sure how to improve it.  If anyone has a suggestion, I'd love to hear it.