Andy Brice mentioned on his blog about how to get website/product feedback from within every page of your website using a free service called Kampyle.
About 2 weeks back, we added Kampyle to our website. Since then we have received some useful feedback about the product and website which we may not have received otherwise.
Kampyle adds a button to every page of your website so that the user can submit feedback effortlessly. You just have to add their script on the footer of your page.