CitizenSpigit is a collaboration and crowdsourcing platform for government entities to support citizen engagement.
From the website:
CitizenSpigit is more than a simple electronic suggestion box — our software empowers citizens to collaborate around a topic of interest to surface innovative and actionable ideas. Crowd sourcing allows government entities to receive suggestions, field questions and facilitate communication with the public, helping government make more informed civic decisions. Government entities have the option of launching an internal or external community, depending on their goals.
Update: CitizenSpigit has been continued—please see the entry on Spigit for updated information.