Few brief comments ..
- add robots.txt file
- add sitemap.xml file
- consider RSS feed
- change the <title> tag to include your keywords
- change your category headers from an image to text within an image (helps with
SEO)
- add .. title="blahblah" .. to your links (helps with
SEO)
- I think the bottom half of the page should replace the top half, ie. replace the flash with the directory links, purely from a commercial point of view IMO (oh, and helps a little with
SEO as the links are higher on the page).