The following is a sample of presentations that have been given at various conferences in the past.
Fast, Easy, Beautiful: Pick Three - Google Developer Day 2007
GWT Fireside Chat: Common Questions - Google Developer Day 2007
Writing Big Apps with GWT - TheServerSide Java Symposium 2007
GWT: Quick relief of AJAX pain (tutorial) - EclipseCon 2007
A Business Case for Ajax with GWT - JAOO 2006
GWT: What, Why, and How - JavaZone 2006