I like the idea of this library. Have you considered turning your FileUploadField into a widget? Eg: one that will give me events of when the user has chosen to upload a file so that I can do things with that event?
Just wanted to say thanks for such an awesome library. Keep it up!
In my GWT app, I was planning on using PlotKit (http://www.liquidx.net/plotkit/) to draw some graphs. I found JS Graphics but they just didn't look snazzy enough. If you felt like including PlotKit you'd save me a bunch of work :)