Without going point by points to counter every reason I would like to say I absolutely love continuous scrolling when I am shopping or looking at items on a retailers website.

>Users will lose the page length orientation - the browser scrollbar become useless.

This is entirely untrue I can still use my scrollbar to get back to the top of the page again, it can also be used to easily skim the results that were displayed.

For most retail shopping I actually would rather have this than pagination especially if I am lazily browsing on my ipad, no reason to change hand positions.