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Clement, those are all good points.

It's a good idea but I would suggest that you really want that as part of your main domain rather than a subdomain. Any links pointing at it wouldn't be helping the main domain. Now I don't know enough to suggest a fix, but a quick google found me this: http://www.google.com/support/forum/p/Webmasters/thread?tid=5e5e79427977d86a&hl=en I've never used mod_proxy, but apparently you can use it to have a different ip address for a subfolder. I believe it's ProxyPass Directive that you're after. Hope that helps.

Agreed, This is like Yahoo answers, old Google answers, or Amazon's askville.

Richard makes a great point Jan (no surprise there eh?)and it makes me realize that I completely neglected addressing user experience in my answer. I was assuming that you would  redirect to an appropriate page. To give you an example of good and bad (from a users perspective), Let's say you had a page dedicated toa yellow 6 man camping tent. It would be acceptable to redirect that to a page listing all your camping tents especially if the yellow 6 man tent was included among them. It would not be OK(again, from a users perspective) to redirect that yellow 6 man tent page to a page dedicated to sleeping bags.