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.
Java's String class is pretty easy to use. I think it's a well-designed class. I understand that String concatenation using + actually uses StringBuffer under the hood (so saith the J2SE 1.3 API spec). Other than that, what practical use is there for StringBuffer in real programs?