The 2010 State of Agile Development Survey
For the last 4 years VersionOne has surveyed the agile community to provide insight into the “State of Agile Development”. At the Agile 2010 conference this year the 5th annual survey was kicked off. Last years results can be found at http://pm.versionone.com/StateOfAgileSurvey.html.
The survey attempts to "gauge the value of Agile Development practices", such as the methodology adoption. You can participate in the survey at AgileDevSurvey.com anonymously or give your information for a chance to win an iPad.
The annual VersionOne survey is the most well known of the Agile surveys, however there are many such surveys done in the community and Scott Ambler has collected a set of relevent surveys done in our community.