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You could always sign up to SEOMOz and run their reports? Like wise Majestic SEO - they provide great link building profile reports that are easy to shar Simon

I found this guide to be very concise - http://outspokenmedia.com/guides/orm-guide/

I completely agree with what Ryan Kent said. As with a lot of things, and even though it is a bit messy, if you are doing things for genuine reasons you are probably OK. If all of the redirected sites are pointing to where the content should be and now resides that is going to be OK, just make sure that you leave the 301's up there for a good amount of time (6 months or more).