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Thanks for the advice Mat  - certainly useful to know it isn't worth investing a lot of time into for SEO purposes.

We've just started using Trust Pilot at www.refreshcartridges.co.uk. We've only been using it for two weeks or so but as I see if there are two potential issues with providing a link but not paying for the service: Unless your customers have used TrustPilot in the past it may look like you're writing reviews of your own website since they will be new users, will only have one review to their name and won't be verified buyers. I don't believe they will share the reviews of your site with Google unless you subscribe.  As such the only people seeing the review will be other Trustpilot users. Apart from that I suppose something is better than nothing, especially if it's free.

Hard for me to tell, but with a million pages and facebook and many others adding useless parameters on the end of our URLs, its been a major problem for a few years. The thing I really dislike about the google interface for handling this is that there is no way to tell them to ignore all parameters. Hopefully, with the number of parameters I've told them to ignore, they just automatically ignore all new parameters.

Great points Dr Pete.