By an inch...

Microsoft redesigns their web site. Visually very nice, follows the “a wide vista” theme as previous one (although I prefer this incarnation).

The gem is under the hood. CSS-based all the way, most obvious by turning CSS off in your browser. Plus, only 5 errors coming from the validator.w3.org, for the HTML 4.0 Transitional. Much can be said on the quality of the code (way too many divs for starters) but really a nice step forward - they missed the validity perfection by only an inch.

The most important aspect - the site looks and works identical in Firefox, as in IE6. Now, that is huge and very welcome step forward for Microsoft.