They are low power and the only analogue bit is the internal adc which means that the signal processing is a lot simpler than a CCD type device.
The one I am using for a project officially runs at 26.6 Mhz with a 752 x 480 resolution but it will run at 25 Mhz it provides frame valid,line valid and pixel clock signals so with a LVDS driver you can hook it into a image capture board which supports camera link.
they are much simpler to interface to than a CCD which requires a lot of analogue processing.
http://www.micron.com/products/cmos/vga/partlist

Ive got some code which does Bayer filtering,gamma correction,adaptive white level correction and so on in an actel igloo fpga so the whole thing is runing at about 100 mW.