This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
On the server side, it runs on Tomcat or a J2EE server. Based on the jar files installed, it is using a lot of Apache SF open source toolkits, but the compilation to something the user side understands is proprietary.
I am going to be experimenting with this so I thought I would see if anybody else is using Flex. Advice? Good sources? etc.? Bill