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.
Struts has some pre-defined message keys that it will use before and after messages: errors.header, prefix, suffix, and footer. Header goes before all messages, and footer after all messages, while prefix goes before each message, and suffix after each message. So, if you want messages listed as part of a list, you could put the following:
If you want a line break between each message, then just specifying errors.suffix=<br> should do it.