I am working on a NLB with Windows 2008 servers and Exchange 2007 Hub Transport and Client Access roles right now.
- VMware & NLB
- MS NLB Team Blog
- Load Balancing Exchange 2007 Client Access Servers using Windows Network Load-Balancing Technology
- Implementing a NLB Cluster
- Deployment Options for Hub Transport Servers
- How to Configure the Availability Service for Network Load Balanced Computers
If you have good recommendations let me know and I will add them here.