The team of at CohesiveFT have launched a great new product called VPN-Cubed, which they describe as the first commercial solution that enables customer-controlled security in a cloud, across multiple clouds, and between the physical data center and cloud(s). I haven't had a chance to dig too deep yet.
I have call with Pat Kerpan and his team on Friday. I'll be able to give you more details afterward. But in the mean time, check out there product page at : http://www.cohesiveft.com/vpncubed