I don't understand what the point of a two-week chart like this is, if the purpose is other than to convince devs they should work on 2.1 apps. If this chart was longer, I think we'd see 1.5 and 1.6 dominate.
Scroll down the page, and there is a historical distribution going back 5 months. Of course, the farther back you go, the higher 1.5 and 1.6 get, but you have to factor in that 2.1 and 2.2 weren't released until 3/15 and 5/15, respectively. The most recent 2 weeks should be a more accurate picture of who is using what version right now. As we move forward, 2.1 and 2.2 are only going to go up as new phones are released and existing phones upgraded.
OK, I couldn't see the second chart was for five months because my eye went straight for this text underneath it: Last historical dataset collected during two weeks ending on July 1, 2010
