Some interesting numbers about worldwide market shares of Smartphones (not dumbphones since those are so uninteresting to me).

First - the handset sales - for Q1-2009 (Gartner link (1) below)
a) Total Smartphone sales over 36.4 Million units, 12.7 percent from same period last year.
b) Regular mobile phone sales of 269 Million units, an 8.6 percent decrease.

Another report contained the OS break outs - for Q4-2008 (Gartner link (2) below)
a) Rank 1 - Symbian - 47% sales market share
b) Rank 2 - RIM - 19%
c) Rank 3 - Windows Mobile - 12%
d) Rank 4 - iPhone - 10%

A totally different site, tracks advertising "traffic" - a side effect of the online browsing advertising impressions.
This site (www.admob.com) shows that active mobile web users are by far iPhone/iTouch users.
These numbers are for March 2009.
a) Rank 1 - iPhone O.S. - 43% traffic share
b) Rank 2 - Symbian O.S. - 36%
c) Rank 3 - RIM - 9%
d) Rank 4 - Windows Mobile - 5%

References:
Gartner:
http://www.gartner.com/it/page.jsp?id=985912
http://www.gartner.com/it/page.jsp?id=910112

AdMob:
http://metrics.admob.com/

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