I've just launched my new web app BugMuncher - http://bugmuncher.com - which allows any website to have Google+ style visual feedback. (For those who've not used the Google+ feedback tool, it allows you to highlight an area of a page, as well as censor private information and automatically generate a screen shot which is sent with the feedback).
Of course, Hacker News is the first place I've submitted it to, and I'd love your feedback on everything from design and usability to price.
Having seen it written on these pages time and time again, I've gone for the most basic implementation I could, so that I could launch quickly. It's taken me 2 weeks of solid evenings and weekends to get this complete.