We where at GuildStats use Datatabels as our primary way of displaying statistics for our users, it allows us to show all the data the user could want with a nice async callback making sure the user experience is great.
We also got a lot of new features for free when we added Datatables, like sorting,filtering and search.

Protobuf-net

protobuf-net is whats behind all caching being done on the site, changing to protobuf-net for a serializer cuts down on storage ( In other words RAM and disk usage ) and even gives us greater speed.