When upgrading from SharePoint 2007 to 2010, you’ll need to upgrade your master pages (if they’re customized) to take advantage of the new features in 2010, such as the ribbon.  The first question is to decide if you want to keep the current master page and add all the new controls in, or to start with a new 2010 master page and customize that.  We decided to start with a new master page based on the 2010 master page, v4.master, and customize that.  Here’s some resources I found useful when creating the new custom master page for our site.
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