On the blogs.technet.com article on microsoft.com's infrastructure: The article reads like a blatant ad for it's own products, and is light on the technical side. The juicy bits are here, so you know what the fuss is about:
- Cytrix Netscaler (= loadbalancer with various optimizations)
- W2K8 + IIS7 and antivirus software on the webservers
- 650GB/day ISS log files
- 8-9GBit/s (unknown if CDN's are included)
- Simple network filtering: stateless access lists blocking unwanted ports on the routers/switches (hence the debated "no firewalls" claim).