Submitting Your Site to Website Feedback Sites
There are a TON of sites that are designed to help you get feedback on your site's layout or conversion potential. Important for our purposes, all of them allow a dofollow link back to your site.
Here's an example from a site called ConceptFeedback.com:
As you can see, there's a nice dofollow link on the page. All you need to do is submit your site with a little description of how you want to improve it.