I use Macromedia Fireworks to edit and optimize all my graphics. I use:
http://www.websiteoptimization.com/services/analyze/index.html
To analyze the web site to see if it loads quickly.
Also, it appears that your menu structure (such as the Academy) are at the bottom. I think they should be more accessible (at the top or on either side) so that users can quickly get to where they want to go.
kw