Android versions on different moblies

Here is an initial overview of Android based mobile phones and which version of Android they are running (shipped, official update, community update)

Mobile phone	Android shipped	official update	community update	Comments
Android Dev Phone 1 / HTC Dream / T-Mobile G1	1.0, 1.1	1.1, 1.5, 1.6	2.2.1, 2.3.7	Update HBoot to 1.3.0033d and Radio to 2.22.28.25 for more available RAM
HTC Desire	2.1	2.2, 2.3.3	2.3.7, 4.1.2, 4.2.2	Use A2SD for more app-storage
HTC Hero / T-Mobile G2	1.5	2.1	2.3.7
HTC Magic	1.5, 1.6	2.2.3	2.2.1, 2.3.7	Update HBoot to 1.3.0033d and Radio to 2.22.28.25
LG GW620	1.5	1.6, 2.2.1	2.2.1, 2.3.7, 2.3.7	...
Motorola Milestone	2.0	2.1	2.3.4	...
Samsung Galaxy Spica I5700	1.5, 2.1	2.1	2.3.4	...

A more complete list of Android devices you can find on Wikipedia.