Nikon 12Mpix saga:
D2X, September 16, 2004, DX CMOS sensor, Sony silicon, ISO 100-800 (expandable to 1600)
D2XS, June 1, 2006, same D2X DX sensor
D300, 23 August 2007, new and improved DX CMOS sensor, Sony silicon, ISO 200–3200 (expandable to 100-6400), only slightly related to D2x sensor
D3, August 23, 2007, FX CMOS sensor, Nikon own design, unknown silicon maker, ISO 200-6400 (expandable to 100-25600), totally unrelated to D2x sensor
D700, July 1, 2008, same D3 FX sensor
D90, 27 August 2008, same D300 DX sensor
D5000, 14 April 2009, same D300 DX sensor
D300S, 30 July 2009, same D300 DX sensor
D3S, October 14, 2009, new and improved FX CMOS sensor, Nikon own design, unknown silicon maker, ISO 200-12800 (expandable to 100-102400), only slightly related to D3 sensor, totally unrelated to D2x sensor
All sensors used by Nikon are actually finished in Nikon own factory, hence the difference between Sony and Nikon image quality.
Sony makes silicon for sensors used in all Nikon DX 12Mpux CMOS cameras (6 of them).
Silicon used in full frame sensors used in D3, D700 and the latest one used in D3s are made by still unconfirmed manufacturer.
12Mpix is probably more then enough for most professionals and D3s is the best professional tool on the market for sports or most other photojournalist jobs.
On the other hand most amateurs would love to have Nikon DX camera with a Mpix or two more.