This project was developed for the imara.gr (http://www.imara.gr) and artifax.gr (http://www.artifax.gr) groups (both currently under construction) and produces the tibcopagebus4gwt library which conatins a Widget that supports the subscribe,publish and unsubscribe functions of TIBCO Page Bus framework.
It makes use of gwt-jsonizer library (http://code.google.com/p/gwt-jsonizer) for serialization/deserialization of message information objects between their JavaScript and Java equivalents. (a custom version is currently used until contained fixes are officially included in gwt-jsonizer manufacturer's next release)
Future directions include the creation of the tibcogi4gwt project which is (as expected) a porting of TIBCO GI widgets to GWT.
Included in future directions is also the creation of the dwr4gwt project, a collection of widgets for integrating a GWT application with the popular DWR framework
Sky is the limit. Anything that can be ported/included/integrated/etc. with GWT is part of this project's future directions.