[bballant]

I've heard good things about Play, but we've chosen to go with Spring MVC because we didn't need the full stack -- we have a lot of existing Java ORM-ish code and a bunch of existing JSP functionality which we wanted to re-use. JSP is actually our biggest pain point at the moment (aside from generally suckiness, it doesn't work with scala collections), so we're looking into using SSP via Scalate, but we've yet to make that move.

Aside from JSP, we're really happy w/ Spring MVC. We've managed to avoid the crazy amounts of XML that Spring is known for in favor of its more modern annotation-based way of doing things.