Even though AdMob’s data is not 100% accurate (data collected is only from individuals who visit mobile web sites), it nevertheless is extremely interesting.
Their latest report (PDF!!) contains two extremely interesting charts. The first one shows the smartphone market share in the USA:

The next one is for the UK:

Not much to add here – the webOS-based Palm Pixi was not visible anywhere BTW!
Related posts:

Beware, to my understanding, those figures correspond to how much those phones access the web, which is different from real market shares (many people do not access the web regularly with their phone).
It’s easy to misunderstand the charts…
Hi Axelle,
thank you so much!
I have stated this in the article above – do you think that I should have made the disclaimer larger?
With best regards
Tam Hanna
P.S: Given that you’re from Fortinet – did you hear about me at one of the talks?