Nikon surprised a few people this week with the announcement of a D40 twin, the D40x. The differences between the two cameras are few. Basically, the D40x uses the 10mp sensor from the D80 instead of the 6mp sensor the D40 inherited from the D50/D70/D100. Thus, the D40x has 10mp, supports ISO 100, gets an additional setting in Auto ISO, and can fire at 3fps instead of 2.5fps. Other than that it is identical to the D40. The D40x will be available as body only (US$729) or as a kit with the 18-55mm II (US$799) starting on March 22. The original D40 (6mp) will remain in production and continues to be the low-end Nikon DSLR.