If you're into Flash and SWF you probably know about most of these but, just in case ...
| Macromedia | The company that started it all. This is where you get the SDKs for the Player and the SWF File format. |
| MiddleSoft | The company that produced the SDK |
| OpenSWF | A very valuable source of information, links to SWF related sites and a forum just for SWF hacking. |
| Swifty Utilities | What can you do if you know how to process SWF files? This should give you some idea. |
| Form2Flash | Form2Flash shows an example of dynamic SWF content done at the server in response to answers from a form the client sends in. |