Optimize HTML

Hi, this should be a simple job. Just look at my website [login to view URL] (and all its related pages), tell me what is wrong with the code, and how to make it more search engine friendly/optimized. Finally, I'd like you to log in and make the changes. I've already submitted this site to 240 social bookmarks tonight and over 1000 directory submissions so I will NOT be needing that. I remember someone telling me that there's a lot of errors in the code, but I never got around to fixing that until now. Being able to speak good English gets higher priority, I don't care if you're more expensive.