Rebol3
The Rebol community has been told that the Rebol 3.0 beta will be available some two weeks later than anticipated (perhaps early August, 2007.)
Having Rebol available as a dynamic-load library will be a significant change. The appearance of a dataflow framework for Rebol is almost as significant (in so many ways, Rebol is Mozart-Oz marketed for the internet.)
Some of the pages here will try to shed light on choosing between Rebol, Curl and Seaside+Smalltalk for RIA with a SOA.