We have several products that are almost identical (basically, different versions of a piece of software: full version, lite version, maybe sometimes an extra-light version).  So the product pages are almost identical except for a few details.

I'm concerned that we might get penalized for duplicate content if each of these things has its own page.  I do have a way to combine them into a single page, with different "buy" buttons for each version.

Then I'm also going to have multiple sites:  mysite.com and mysite-europe.com.  And they'll have almost the same product mix.

Any thoughts?

Thanks,
Stefan