ChromeIdea

Idea Informer (http://idea.informer.com/) creates the feedback system and provides you with a free platform for putting together your visitors' minds, ideas and recommendations on your project. All you need is to register your project and install an Idea Informer widget on your website.

But you can use Idea Informer to work together with your friends and colleagues even if you do not have own site. Just create a new project. Install this extension for Google Chrome and ask your friends also install the extension. Adjust the options to work with your project. Wow! You now have a convenient forum for your group, or a small bugtracker system, or...

Of course, you can create an Idea Informer project and only for himself alone. Then you will have the personal todo lists. :)

Russian: русский вариант - https://chrome.google.com/webstore/detail/iieicmajmcbnimmappfcnpinmlooidea