I updated the OpenSSL libraries Monday night right after the Centos updates were released. I was getting a false positive once or twice soon after, but haven't seen them in more recent tests. This is a result of the scanners getting overloaded; there have been no changes on our server here since that initial update. Here's the most prominent one I've been seeing referenced:
http://filippo.io/Heartbleed/
The timing for us is pretty amazing, actually. I just created the cert over the weekend, so the time for the vulnerability to be open right up unti lthe time of the patch was only a day or two, compared to any other site that had SSL up and running before, say, this weekend.