Google has been busy over the last few years developing and acquiring technology that would end up being hosted applications such as Docs and Spreadsheets, Calendar, Talk and Gmail. While many individuals and small businesses have embraced the hosted concept, big business is a harder sell with security being the major concern. Google has made a large stride towards easing these concerns with news today that they are acquiring Postini, "a global leader in on-demand communications security and compliance solutions". The deal worth $625 million will likely get done in the 3rd quarter of this year, according to the news release. While there are obvious gains for Google, they promise to "continue to support Postini customers and invest in Postini products."