Lambda the Ultimate

Can anyone point me to any work on declarative languages for user interfaces? I'm aware of the plethora of XML languages, a favourite of web frameworks in particular. I mean a more concise declarative UI or layout language.

I've built a small declarative library which outputs HTML, but I'm not really satisfied with it, so I'm wondering what other work has been done here for describing the high-level user-interface structure.

Does anyone know of a project roughly similar to the Programming Language Shootout, but for comparing web application frameworks? I'm especially interested in seeing small-to-medium-sized web applications implemented with different tools, with a focus on seeing how each tool enables component reuse.

As I announced in a recent post, I'm working on a DSL for web application programming, and I'm looking for ways to quantify the advantages it provides over the competition. So far, I've been unable to find even a single comparison of the proper kind on the web.