Voices for Innovation is Microsoft's latest astroturfing campaign in favor of Microsoft's Office Open XML format. The purpose of the campaign is to simulate a great interest of small, innovative companies in the standardization of the format.
The principle is about as old as the name. During the software patent debate in the European Parliament, the Campaign for Creativity, a collection of Microsoft Gold Partners and spin-off companies from former Microsoft employees, tried to imitate a grassroot lobbying movement, strongly voicing the opinion that small companies can only be innovative if they get the power of software patents.
Wikipedia has a definition of astroturfing.