It seems likely that the changes that you made to your theme are your main problem. I say this because doing a view source reveals that you have lots of info and links that are being sent that simply aren't visually there.
The <noscript /> tag in your geovisitor stuff looks strange, but I don't think it alone is your problem. Changing it to </noscript> definately wouldn't fix the problem because there is no opening <noscript> before it to close. That <noscript /> is an empty tag that opening and closing itself on one shot. In other words, it should simply be removed.
The second is where you are putting that code. I think it is complaining because it is in a paragraph tag. I'm not sure though. That doesn't look like it should be causing you this trouble, but it is possible. Remove your GeoV stuff and see if your page works.
If not, switch back to the default WordPress theme and see if it works any better then. If it does, you may want to reinstall Ocadia. It is a 2.0+ theme, so it should work fine for you if added code doesn't interfere with its funcionality.
I also strongly urge you to upgrade to at least WP 2.0.3 if not 2.0.4.
Hope you get it all sorted.