Microsoft has launched a website where Windows Phone users can express their thoughts about the mobile OS and offer suggestions on how to improve it. Once an idea is posted, others can vote on them, presumably to direct Microsoft on what to work on next. You can filter the list by what's new, hot, accepted, completed and most liked. Completed suggestions even get responses from Microsoft explaining what actions have been taken.
What's particularly cool about the site's setup is that each member is given 10, and only 10, votes that they can distribute among the suggestions on the site. You are free to change your votes around by moving them from one idea to the next, and your vote will be returned to you if the idea you vote on gets completed by Microsoft or deleted.
In order to vote, you must either create a login using your email address, or sign in using joined logins, like FaceBook, Gmail, Twitter, etc. (there are a lot of them). Click on the source link to get started.
Source: Microsoft (Thanks for the tip, ShipWreck!)