My flash-usability research has led me to Girlzilla's Usability Testing Tips. Even if you couldn't do usability testing, if you did the first four tasks you'd probably improve your product.

1. Define Business Goals

   
   

2. Determine the User's Goals

   
   

3. Identify Your Users

   
   

4. Create Usability Tasks

   
   

If you create a list of tasks (#4) based on the user and business goals, then go through them yourself with #3, your target user, in mind you will probably quickly spot many usability problems....

Also interesting was their "Flash Usability Tips," though the reason it interested me was that it wasn't much different than most web usability lists. I know there must be usability challenges unique to Flash-- anyone want to share a few?

While this whitepaper on taxonomies is mostly a marketing tool, it does show why taxonomies are important (thanks noel!)

While getting prepped for an upcoming conference, I did a quickie google search on flash+usability, looking for a wonderful article on fitts law on flash I'd found before. Look at the first result

If you are in the bay area, and you dig all that IA jazz, you probably want to check out the August Cocktail Hour