How do I uninstall rEFIt?
It seems that the solution is the same one listed there under "troubleshooting". Initially I was thrown off by the wording used. I thought that "If Mac OS X no longer starts up.." meant OS X didn't start up at all, but what it really means is "If Mac OS X does not start up automatically instead of rEFIt..."

I just followed the directions listed there and now it uses the default boot sequence.