VortexBox has been running on Fedora 11 for a while but there are some improvements in Fedora 13 so at some point we will need to upgrade. Not sure how we are going to do this as upgrading between versions of Fedora can be tricky.
I did manage to get VortexBox working on Fedora 13 as a clean install though. You can try it out if you want.
Consider this ALPHA quality but everything seems to work.