I know you got an "A" in Intro To Computer Programming, and yes, Adobe Flash MX does make it easy, but look, that isn't enough to claim you know what you are doing.
In the past week or two I've run across dozens of sites which insisted on a particular browser/flash version level. Ok, I guess we'd never make it without the latest greatest gizmo on your website (oh you haven't actually changed ANYTHING?) But seriously.
There are a couple of sites that don't actually care what version of Flash you have (even though that's the message you get) but will absolutely not work unless you have IE7.
This morning I get one condescending enough to "allow" firefox, but requires a version greater than 1.5. Unfortunately in "I Passed VB.net but Failed Arithmetic" world 1.5 is greater than 2.0.
I might also point out that in several cases the only thing that was actually"incompatible" was the browser detection script.
Get a clue guys. You can be a little more compatible if you try.