It's compatible with Gears 0.2 (current "desktop" version) and released only for Windows Mobile IE for now. The main useful functionality is the persistent store which can be used as a cache between sessions – which will save data bandwidth and it provides a consistant Javascript API across mobile browsers. They say the Android

See http://google-code-updates.blogspot.com/2008/03/power-up-your-mobile-web-applications.html and http://googlemobile.blogspot.com/2008/03/shifting-google-gears-to-mobile.html

(I'm really excited about this because I was working next to guys at Google who did this when this was under development and I thought then it was the coolest idea for enabling mobile apps. I just hope it hits off.)

Incomplete sentence: They say the Android (Webkit) version will follow.

Btw, when I say the main functionality is the persistent store – it means mobile apps acn work offline, in case the significance of this isn't clear.

Maybe I should hold out for an Android phone.

Can't wait till this comes out for the iPhone.