Still loading veeeery slow for me. I'll try again a bit later.

Definately replace the "your ad here" scrolling text with a demo banner of some sort.
I don't care for the "home, mail, links, faq" font that you used - it doesn't seem to go well with the site design. Along with the font them, I don't really like the templatearchives.com font either. Perhaps come up with a logo to use with a bit more color in it, and use the same colors (brighter possibly) throughout the rest of the page to offset the logo, and brighten up the pages a bit.
Hope that makes sense ;)

Templates seem "ok". None of them are really my style, but i think you could broaden the designs a bit. Offer more templates at different ends of the spectrum. Perhaps a few WinXP style templates a lot of people like these days, etc. I couldn't get too far quickly, but are there color options for each template? Maybe offer the same template, but in red, blue, green, etc. (changing the graphics of course to match each one)

I'll post more thoughts when I can easily get past the index page