I think it's mostly Play Framework on top of RDS in terms of Scala usage.

Of course, Play is on top of Akka

You can use Play and not care about Akka that much. I think the original question was about using Akka directly.

Bits and pieces of Akka in a few places, but not commonly

and of course... good old Django :P

of course, old faithful will be around for a while yet..

Let's go for a beer soon!

that will be nice! :)