Worthy of mentioning is probably Accusim 1.1 update video since it mostly deals with Spitfire (with some P40 teasing):
viewtopic.php?f=77&t=26794(That thread also contains download link to the update if you haven't installed it. Accusim update is for Accusim only.)
Also worthy of mention, Spitfire propeller tutorial video:
viewtopic.php?f=77&t=23539Due to nature of global announcements disappearing when they become outdated (unlike forums which are accessible in proper section), this link will be to the video itself, not the thread:
A2A Simulations Development Update Oct 2010:
http://www.youtube.com/watch?feature=pl ... KfU#t=209sMostly Spitfire stuff, especially after 03:30 mark. This video was released before the plane was released, and the plane is beta (MkII with electric starter, something that didn't exist in reality).