This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
I'm using Struts with Flash right now. It's really no different from using Flash with PHP, Java Servlets, Perl, Python, whatever. The Flash movie is delivered to the browser and may begin sending XML-over-HTTP requests back to the server. There's nothing Struts-specific about that.