Interesting post on John Nack's weblog that's based on a survey of 1,026 pro shooters by InfoTrends stating that 2/3rds of them are using Photoshop over Lightroom and Aperture.
Colleen Wheeler followed up with more anecdotal information in her post Yes, We Still Love ACR. Regardless of how much you trust the actual InfoTrends data, or believe the anecdotal, this is interesting.
My take on it... photographers are creatures of habit. They're already buying Photoshop CS3 because they need it. ACR and Bridge are better than ever. I'm not surprised that they are sticking with what they know.