Kestrel Airfoil Pro...

I ride one and love it.  I was previously on a Cervelo P2 and wouldn't go back.  The Airfoil is a great bike because of the geometry.  The smallest is the lowest bike on the market (stack and reach) meaning it can be the most aggressive if that is your size.  

The ride is comfortable as well since the seat tube is not the whole way through.  I can attribute some of the gains I have seen so far to my winter training, but I also know my fit is dialed in more than my previous setup being able to get some more drop up front.  

4 weeks until the first race of '11, hope for the bike split to be something to the tune of 23.5 mph average!