This is useful. I'm currently working on a blog post myself about data center certifications in preparation for the launch of the "Certified Data Center Directory" (coming soon). Here are some others that you may consider:
Global Certifications
ISO/IEC 20000 (IT Service Mmgt)
ISO/IEC 27001 (Security)
ISO/IEC 9001 (Quality)
ISO/IEC 14001 (Environmental)
PCI DSS*
Uptime Institute - Tier I, Tier II, Tier III,Tier IV