I m doing a lighting talk about jQuery and ExtJs (maybe mention GWT) in the next Ruby Ireland on the 9th of September link
I ll add a link to the slides as soon as i finish them, any suggestions very welcome. so far i m doing a quick intro, some of the features, stuff i found useful or interesting or use with code samples and finally some links. For jQuery I m touching on ui.jquery and themeroller and the event observer implementation link
For ext again intro and show some code and then maybe touch on EXT (GWT implementation of EXT Js) just started to have a look at this but it does seem very promising
Cheers