Ah mambo, I have used that theme before! It is nice, mambo is hard to manage but once you get the hang of it it'll be really easy to use. Anyway, the site itself looks good and the content isn't the greatest aspect of the site. I personally prefer a hand coded website using PHP and MySQL, but if thats not your thing...then good luck with your site.
Suggestions:
- New logo
- Something on that entire blank rectangle on the right