Please can you critique my site, desperate for outside views

Hi everyone.

Please could you critique the new version of my site, its about 90% complete, im desperate for some outside views on it please.

I set my own brief in that it should be clean with simple navigation and be professional looking (maybe slightly corporate). Also, i needed it to include php, xml, mysql (eventually in the guestbook), rss and the usual flash, html, css, seo.

Going by all this then it is a vast improvement on version 1 (in web design section).

www.iso-land.com

Dont hold back with the opinions!!
Thanks