Who wants a free copy of Windows 7? You probably just instinctively raised your hand or yell out "me!" without thinking twice. Well, we've got good news for you. Microsoft is hosting The New Efficiency
launch events in 25 cities between September 28, 2009 and November 9, 2009 for Windows 7, Windows Server 2008 R2, and Exchange 2010. All attendees will be receive a free copy of Windows 7 Professional. The events are targeted at IT professionals (Windows 7, Windows Server 2008 R2, and Exchange Server 2010) and developers (Windows 7 and Windows Server 2008 R2).
More here - Free: Windows 7 Professional at upcoming launch events (US-only) - Ars Technica