Flash is cool, youtube is based around it, flickr use it to organise your photos, the flash plugin has been included in IE and most other browsers for years so if you export right there shouldn't be any reason why someone can't see the content. Flash is also the one thing about the internet that is standardised. Getting your code to look the same in every browser and W3C compliant could take forver, unless you just have a plain text website. Getting your flash website to look the same on all platforms and browsers is a doddle.
As for my site, the nav makes a little noise and there is a little animation when you rollover. I suppose you could do the animation with a gif, but the filesize would be much larger, and you could play a sound with javascript, but that would be a mission.
I know, my site is very old now and it was one of the first XHTML things I did. I've caught up with the semantics since then. Also might be worth mentioning you have an error in your markup too -
see 
. I'll make an effort to make the W3C happy.