Announcement Wars: DSLRs vs Mirrorless interchangeable-lens digital cameras
While the three Doctors were busy fighting over Rose, we managed to sneak into the Tardis and use their time-graphing-computer to produce the bar chart you see below, charting the announcements of DSLRs (35mmFF or APS-C) versus mirrorless interchangeable lens digital cameras (RFs are included but not Ricoh GXR [add +1 to November 2009 if you think the Ricoh GXR should be included in the mirrorless iLC segment]). Medium format, digital backs and film cameras are not included. You can find the actual cameras in the Cameras of 2010 and Cameras of 2009 pages. In the chart below, blue is for DSLRs, orange for mirrorless.
Of interest in this "war" is the current year, 2010 [as of June 30, 2010], where we have just five DSLRs so far, but they are not as many as they sound - three Sony Alpha more-of-the-sames (A450, A290, A390), the final announcement of the Sigma SD15 (which some could easily argue should not be included in 2010; subtract 1 from February 2010 if you don't think the SD15 should count]), and the Canon D-Rebel T2i/550D, which has turned out to be quite popular among buyers.
On the other hand, the mirrorless world had seven digital cameras in 2010, including the launch of the Sony mirrorless system (NEX-5, NEX-3), the launch of the Samsung mirrorless system (NX10, NX5), and three Micro Four Thirds (Olympus E-PL1, Panasonic G2/G10).