Is there a way to sort the race servers so I can group all the servers together that actually have people racing in them?

Yes, disable the "empty" flag on the bottom of the list to only view servers that aren't empty.

Vain

Gotcha, thanks a lot.

but, of course, remember that lots of people do that, so it's not necessarily a bad idea to join an empty server - once you join it, it won't be empty any more, it'll show up on the list for all those people who disable empty servers, and so you'll probably find other people start joining quite quick .