The
alphaWorks project related to State Chart XML tools was
posted today.
It includes a RSA (Rational Software Architect) plugin for transforming UML state chart and activity diagrams into SCXML.

It also contains a Mozilla extension allowing the execution of event-based controllers within XHTML documents.

Surely the bits are subject to improvement, minor tweaks et al, and theres currently a need for JNI while we wait for a C++ SCXML interpreter in the public domain.
But we can now draw UML charts, transform them to SCXML and execute them. Quite useful.
In addition, given examples of server-side usecases
like these, and the Mozilla extension, the network boundary for the application controller just became a whole lot more fluid. And thats quite useful too.