From The New York Times:

The average iPhone or iPod Touch owner uses 5 to 10 apps regularly, according to Flurry, a research firm that studies mobile trends. This despite the surfeit of available apps: some 140,000 and counting.

I've seen the same stat mentioned before. Heck, I referenced that stat in a piece I wrote. But what I find surprising is that anyone is surprised by this. It's the behavioral equivalent of the Long Tail: a few apps get frequent use -- the blockbusters -- while the others wane after post-installation popularity or, even worse, don't get downloaded at all.

Instead of this broad-based stuff, what I'd really like to see is data that links up people's interests/professions with their most-used apps.