This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
The Lesser GPL is closest to the Apache license, while the GPL and Affero GPL are rather different. It's definitely something to think about - what do you want to achieve with your project, how would you like people to use it, etc.