WC3, while nice and all, doesn't have quite as much impact on your seo as you might think. I know you're more concerned with dynamic content and whatnot, but I wanted to chime in on the WC3 thing because I know a lot of folks really put a lot of stock into it.
Try running a validation check on google.com.
I'll save you the trouble... It doesn't pass.
See for yourself...
Well, how about CNN?
Not even close.
Say it aint so!
Get the idea?
I've heard reps from both Google and Yahoo say pretty much the same thing. It's great and all but it doesn't neccessarily help or hurt you all that much.
Actually, I don't think it matters a bit.