As previously reported by Neowin, Word 2007 will support blog posting. To add to this, Microsoft has commited to having the HTML posted from Word be very very clean.
In addition, Office 2007 will run both on Windows Vista and Windows XP. The article below gives a more detailed first look including screenshots of what Office 2007 currently looks like under Windows XP vs. Windows Vista. The new UI is a major departure from the past.
Many developers are wondering whether this UI should be adopted elsewhere. Microsoft has begun using the orb-like UI (from the Windows Vista Start button) in other applications as well despite there being no mention of it in the Windows Vista UI guidelines.
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