Do you know which Vanilla installation is the most active one, in terms of the number of threads and users? I wonder how it would behave under large load. I plan some performance testing in regards to showing the number of new messages feature and search engine.
I doubt anyone knows and i dont think this would be a particularly easy thing to find. Mark should have put some report-back stuff in the code so he could monitor how widely spread it become and how many people used it. But i guess thats verging on spyware and is a bit sucky.