Is the FSX SP2 Update (for the SDK) the one that is included with the Acceleration Pack?

Hi PatrickYes. If you have installed Acceleration you don't need the SDK SP2.-Dai

Although there have some who've cried about the new SDK being a unified .chm format, I like it a lot! The cross-reference links are instantaneous, and the fellow who's now the full-time technical writer has added a lot more clarity and consistency to the document.What's particularly nice is that all items/features that're "Acceleration specific" are marked in red text, so it's easier for us to design product that's targeted for either SP2 (and lower) or Acceleration only... ;)