Google has announced Google I/O 2009, Developer Conference. I attended last year's event and I hope to go again this year. There will be sessions on App Engine, Android, Chrome, GWT, and other topics.
At I/O '08 I had the great pleasure of meeting members of the GWT team including Bruce Johnson, Sumit Chandel, and Miguel Mendez, as well as fellow GWT application developers. That was the first time I'd attended a developer conference and I found it completely worth the time and effort (I had to fly across the country to attend).