Our servers in us-west-1 are still showing as vulnerable sometimes. Even with that 99 designs link, if I refresh sometimes if passes and sometimes it fails. Possibly the patch is still being rolled out?
Beware that that tool is often returning that your domain is not vulnerable when really it is. Appears to be a load issue. I'm not confident that any ELBs are patched yet.
https://twitter.com/lox/status/453443517017100288 http://filippo.io/Heartbleed/#99designs.com