I was reading yesterday about duplicate site content (descriptions etc) across multiple sites or stores, it turns out that with the launch of Google Panda update, the organic search results suffer.
I have had this happen to me on .com searches, but not on .co.uk searchs (organic) I wonderd ifDaniel or the other devs know about this? maybe a future update??
To get around this, I will have to manually create duplicate products for my stores, each with different descrptions, or spun descriptions. I would guess it's the same for content. It is a pain considering I have to add 100's more products

I got my info from:
http://www.further.co.uk/blog/5-ways-to ... -sites-321
Google take on it:
http://www.google.com/support/webmaster ... tent&type=