One of my 156 predictions made in March 2006 was that gigapixel cameras would be common in the 2009-2015 timeframe. The Seitz Roundshot that takes 470 Megapixel images in 3 seconds and costs $36,500 is getting very close. There are other gigapixel scanning cameras and cameras for satellites and space applications but those will not be common.
Seitz Phototechnik has the 160 Megapixel camera. The camera costs $35000 (Euro 25000). It takes the 160 megapixel shot in one second.
Vision Research Advances 1,000,000 Frames-per-Second High-Speed Digital Camera Offering With Launch of the Phantom(R) V12.1 Many rapidly shot lower resolution digital pictures can be stitched together into a larger high resolution image.
Sony has the Alpha 900 out now for $3000-6000 with 24 megapixels for a digital SLR camera.
DSLR Killer in Late 2009 from Company Now Killing 35mm film