Microsoft SharePoint 2010 Upgrade Planning

I recently came across draft guidelines from Microsoft that describe the requirements and considerations for planning to upgrade to SharePoint 2010. It's a one page document. It's easy to read to and to the point. I found it quite useful. Microsoft describes this document as:

"This model covers planning for an upgrade from Microsoft Office SharePoint Server 2007 or Windows SharePoint Services 3.0 to SharePoint 2010 Products.
It includes information about the following: Upgrade requirements: Hardware, operating system, and database
Upgrade process: specific steps to follow before, during, and after the upgrade"

You can download it from Microsoft Download Center: