well, i know they say you cannot offer the same items on your site for less than on ebay. and from the way i'm reading the current policy on links, the 'more info about this item' page can have the item for sale. just cant offer other items for sale.
i could be totally wrong, but that's the way i'm reading it
i've been too lazy to actually test it. except when i had some of father's barely worn flannel lined jeans up for sale. and those i put a link to the mfg's site as a 'more info' link. and it was for sale there. and those listings stayed up. (but it didnt point to my website, pointed to mfg website)
I guess I should add, though that your mileage may vary.
My suggestion would be to have link to website with more info about item, but not directly offer that item for sale on that page. And to have links to various parts of website on that page. That'd be my suggestion/recommendation. but the way i'm reading the rules, having it for sale on the 'more info' page is okay as long as there's not other items offered directly for sale on that page and as long as the item is cheaper on ebay.