If you are looking to migrate to Exchange 2010 from 2003 or 2007, or prehaps perform a new Exchange 2010 installation there is a cool tool Microsoft has just released called Deploy Assist.
The Deployment Assist tool asks you a series of questions about your environment. Based on these questions it will then provide you with step by step instructions on how to perform the migration or fresh installation of exchange 2010. This is very handy as it tackles all kinds of network environments.
To use this tool go to the following link: