EBS volume encryption

Here are two companies that offer EBS volume encryption:

1. SafeNet ProtectV

     A. Support for boot volume encryption

     B. Good integration with Hardware Security Modules (HSM)

     C. Somewhat limited OS support  

2. Trend Micro SecureCloud

      A. Good support for RAID arrays

      B. Supports IAM roles for EC2 Instances, HSM support 
      C. Support for root volume encryption

           D. Supports AWS Storage Gateway as well as EBS volumes