I had the distinct pleasure of building some new LCDS 3.1 samples for Tour de Flex recently which just went live. For each sample, I thought it would be helpful to elaborate on each one a little bit more to help give ideas about what the new features can do for your applications.
For the data throttling and reliable messaging samples, there is a Java class that iterates a number and pushes it out to an LCDS destination the samples subscribe to. The reason for this is to simulate constant incoming messages to Flex. The iterated number itself goes on for a few minutes and restarts at 0 so you can see the order the messages come in.