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.
Use html:multibox instead of html:checkbox. It still produces checkboxes, but is designed to be used with a group of related checkboxes all with the same property name. Below is the link to do documentation.