Here is an interesting report on the global sales volumes of DSLRs (by brand and share) in 2006, 2007 and 2008:-
http://www.photoscala.de/Artikel/DSLR-Welt-im-Wandel
(Text in German, the Google translated version in English here)
Well, Pentax still came last amongst the "big five" whom has a "proper" DSLR *system* (but not the remaining "minority" players). Now, their global market share has dropped to 4% (from 5% in 2006) in the last year.
So, will it be in 2010, Pentax will have only 3% of the share according to the trend?