Additionally to this (granted) small blog, I sometimes write short entries on the Testing With Spirent blog. The last entry was published today: Finding Avalanche Version from Project Files. It should help people with a lot of older SPF files they need to import.
The article before that was a little more technical: Using Avalanche to test the MAC address capacity. In it, I explain the two different ways of using a lot of MAC addresses during a test, and which is best depending on the test case.