I’ve been developing a Flash application for a CD-rom recently for my last internship before graduation. Permissions, priorities, and even some of the design aesthetic are… totally Bizarro-world compared to web applications. It’s like looking at the tool from a completely different angle.
Here’s some random thoughts/discoveries from the last few days:

1. AS3’s TextField CSS rules don’t really support contextual inheritance, and it fails badly.; .credits p {} not only doesn’t work– it will cause The rest of the Stylesheet it’s not included in to not work. Naughty naughty!
2. Importing video with alpha is surprisingly painless. (v9+)
3. Resize-with-player is both extremely simple, but not as robust as you might expect. (It’s totally globalized… but you wish it wasn’t.)

Nothing groundbreaking, just there.