I never claim to be an early adopter, and only recently discovered the value of Google Alerts. Now Matthew Campagna shows me the use of Google Trends by charting searches for Adobe Lightroom and Apple Aperture:

One thing to consider, however, is that Aperture remains exclusive [JB: in the sense of “limited”] to Apple computers, while Lightroom enjoys searches from users of both Mac and Windows platforms. Clearly, Lightroom holds an advantage in this regard, but the disparity is nonetheless impressively in favor of Lightroom.

I'm unconvinced that one needs to be so kind to Apple - it's not as if the results are skewed by including all photographers - but it's also interesting to see how searches for both applications compare to those including Photoshop: