http://www.traeogbyggevarer.dk/
This is a Danish webshop, selling construction materials, tools and much more. It holds more than 10k products and 400 product categories.
The shop features a full size background image/product slideshow on the frontpage, a handcrafted TOP10 tap menu, Motools drop-down top menu, support for external image links for product images, heavily modified product details page with extensive functionality for the "Related Products", Rupostels One Page Checkout and much more.
For a sample of a product with a full "Related products" list see this product:
http://www.traeogbyggevarer.dk/hus-have/hytter-carporte-og-skure/hytter-annekser/jabo-anneks-nytorp-10m2-detaljer
The site is currently undergoing a speed optimization process and is still not optimized.