</div>
Apprently there’s a lot of things WordPress don’t "like". Flash seems to be one of them since you need plugins to make it (possibly) work.
I’ve installed a plugin called pb-embedFlash and it actually works. It makes it very easy to add flash to your WordPress pages. Though there is a problem.
I made a small gallery, loading pictures through a XML-file, and the plugin won’t touch the XML. It pretends like it’s not there. (Stupid.) 
But I think I’ve found a way to work around that which means I can finally upload some flash to my portfolio. That’ll be nice.
(Not really sure I’ll do it right now though.)
Oh, and by the way… Here’s a tip on how to write validated not-messed-up code in WordPress!
First of all you turn of the visual code mode. It’s just good at spoiling your code and making it impossible to validate once you’ve edited it once or twice. Instead you use the code mode and write your code "raw".
Now, I don’t like that small little box that WordPress have for you to write in. I lose track of what I’m writing really fast.
Instead I write all my text in DreamWeaver and paste the code into WordPress. Easy. And really fast. (Go DreamWeaver!) 
(Hehe, talk about blunder… I was going to validate my code again just to check and found that the favicon tag wasn’t closed. Duh!) 