I’ve been running it in a limited fashion since Aug and testing the betas since April. Exchange 2010 is a MAJOR update completely changes the thinking around high availability and scalability.
EHLO Blog post availability: http://msexchangeteam.com/archive/2009/11/09/453096.aspx
My previous post on 2010: http://info.izzy.org/Blog/archive/2009/04/15/Exchange_2010_Its_official.aspx
Other blog posts on 2010:
2010 Deployment Assistance wizard: http://msexchangeteam.com/archive/2009/11/11/453172.aspx
2010 goes RTM: http://blogs.zdnet.com/microsoft/?p=3727
RC announcement: http://msexchangeteam.com/archive/2009/08/17/451974.aspx
Been too busy lately to work on articles or detailed posts on it, but hope to find some time in the next month or so.
Once I get new SSL certs I will be removing my last 2007 server and be 100% on 2010. My 2010 servers will be running on four (2 CAS/HT & 2 MBX) HyperV VMs, on two different servers to provide HA.
DigiCert’s, best place to get your SSL certificates!, Exchange 2010 PowerShell CSR (certificate) request wizard: https://www.digicert.com/easy-csr/exchange2010.htm