I see the VS2010 Pro includes LightSwitch. But from the LightSwitch website only has links to download the 30 day demo (which can be extended by 60 days with a registration
Though it not explicitly documented, seems like you can download "full" version of LightSwitch for VS 2010 only if you have MSDN subscription or any of following levels:
Developer AA; VS Pro with MSDN (Retail); VS Premium with MSDN (MPN); BizSpark Admin; BizSpark; VS Ultimate with MSDN (VL); VS Premium with MSDN (VL); VS Pro with MSDN (VL); VS Premium with MSDN (Retail); VS Ultimate with MSDN (Retail); VS Ultimate with MSDN (MPN); MSDN AA Institution; VS Ultimate with MSDN (NFR FTE);