There are a lot of websites offering the possibility to easily gather feedback from users. A lot of the websites have a priced plan, but idea.informer.com offers this service for free. I wanted to easily integrate that into my site, so I wrote a very basic and simple module, and I wanted to share it with the community, so we could improve it together. Read more about it on the project page, and feel free to open issues and create patches. It is still in an early alpha.
So far I have implemented it on vih.dk, if you want to see it in action.