Greg has a list of Microsoft Office 2007 blogs that cover the individual Office components. They do have a Microsoft Frontpage blog that also covers Microsoft Office SharePoint Designer 2007 and Expression Web Designer.
Microsoft Office Project 2007
• What's New in Project 2007 (Dieter Zirkler)
Microsoft Office Publisher 2007
• Publisher 2007, XPS and more (Jeff Bell)
• What's New in Publisher 2007 (Rob Dolin)
Microsoft Office Visio 2007
• Visio 2007 (Eric Rockey)
Microsoft Office Word 2007
• What's New in Word 2007 (Joe Friend)
Microsoft Office Access 2007
• What's New in Access 2007 (Eric Rucker)
Microsoft Office Excel 2007
• What's New in Excel 2007 (David Gainer)
Microsoft Office FrontPage 2007
• What's New in FrontPage 2007 (Rob Mauceri)
Microsoft Office OneNote 2007
• A User-oriented View of OneNote 2007 (Chris Pratley)
• OneNote General (Owen Braun)
Microsoft Office Outlook 2007
• Outlook General (Will Kennedy, GM)
• Outlook Tasks and Time Management (Melissa MacBeth)
• RSS/Search/Sharing (Michael Affronti)
• Outlook Programmability (Ryan Gregg)
Microsoft Windows SharePoint Services 2007
• Windows SharePoint Services (PJ Hough)
• Document Management, Workflow, & Records Management (Rob Lefferts)
Office 2007 New User Interface 2007
• Office 2007 New User Interface (Jensen Harris)
Office 2007 New XML File Format 2007
• Office 2007 New XML File Format (Brian Jones)
Publishing XPS Documents 2007
• Publishing XPS Documents (Andy Simonds)
• Publisher 2007, XPS and more (Jeff Bell)
PDF Support in Office 2007 2007
• PDF Support in Office 2007 (Cyndy Wessling)
TechTalk with Steven Sinofsky 2007
• TechTalk with Steven Sinofsky
Source: List of Office 2007 Blogs