Thanks for the recommendations. I need to study both Elm (never used it) and PureScript (have just played with it). I am almost ready to publish my first Haskell book (my take on getting started the easy way, with a tutorial for a subset of the language and some cookbook style coding recipes to play with). I am thinking of doing a volume II cookbook that covers web development, and other topics. I use scotty and yesod, and experimenting with Elm and PureScript sounds good.
Servant is still _very_ rough around the edges, imo. I like it a lot for mocking APIs [0], but I'd be wary about using it in production for anything other than a small service.
Right now I'm keeping an eye on servant-auth [1] and the GHCJS implementation of servant-client [2], as they're both extremely compelling.
[0] Recently, I needed to test something against a work-in-progress API. I wrote out a rough type-level specification and had servant-quickcheck generate arbitrary data. When I needed to test more concrete data, it was trivial to incrementally move endpoints over to concretely defined stubs.
