We have just posted an updated PDF of the Flash Platform ActionScript 3 RIA API Guide. The new guide includes updated apis for Adobe AIR 1.5, Flex 3.2 and Flash Player 10.
You can find more information on the guide, as well as download the PDF from the developer center.
You can view some images of the previous guide here.
We also have printed versions of the guide. If you are MAX, you can find one in your goodie bag. If you are not at max, I will be sending some guides and new eboy sticker sheets next week. Watch my twitter account for more info on how to get one.