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If I would be at your place I would have used the idea that you come up with... add user generated content but do check the GUC section you are adding it should not contain an iframe or else there will be no use of it.

Thank you!

I hate to bring up an old thread, but here's the answer if you're still looking for it: http://yoast.com/google-wordpress-and-trackback-urls/ Cheers.