I came across the Ur/Web project during my search for web frameworks for Haskell-like languages. It looks like a very interesting project done by one person.
Looking at the demos and their source code, I think the project is very promising. The latest version is something 20110123, so it seems to be under active development at this time.
Has anybody here had any further experience with it? Are there problems/annoyances compared to Haskell, apart from ML's slightly more verbose syntax?