Over 3000 downloads! Thanks everyone.

Number of unique devices = 3068
Number of visits = 34600

OS version:
3.0 => 30
3.1 => 10
3.1.1 => 2
3.1.2 => 220
3.1.3 => 1248
3.2 => 70
4.0 => 1385

Device type:
iPhone => 2676
iPad => 70
iPod Touch => 322

People are using the refresh functionality (released on 24th June):

Roughly alf have upgraded to iOS4:

Most people upgrade when I release a new version:

Number of unique devices = 1029
Number of visits = 19703

OS version:

3.0 => 11
3.1 => 5
3.1.1 => 2
3.1.2 => 102
3.1.3 => 862
3.2 => 37
4.0 => 4

Device type:
iPhone => 874
iPad => 37
iPod Touch => 118

Version:
1.0 => 487
1.1 => 539
1.2 => 0 (coming soon)