The FIA released the 2008 formula one calendar, also engine development has been frozen for 10 years from 2008 in a bid to cut down engine development costs for teams. Also its been confirmed that on September 28th 2008 the first ever formula one night race shall take place.
2008 FIA formula one calendar:

March 16 Australia (Melbourne)
March 23 Malaysia (Sepang)
April 6 Bahrain (Sakhir)
April 27 Spain (Barcelona)
May 11 Turkey (Istanbul)
May 25 Monaco
June 8 Canada
June 22 France
July 6 Britain (Silverstone)
July 20 Germany (Hockenheim)
Aug 3 Hungary (Hungaroring)
Aug 24 Europe (Valencia)
Sep 7 Belgium (Spa-Francorchamps)
Sep 14 Italy (Monza)
Sep 28 Singapore
Oct 12 Japan (Fuji)
Oct 19 China (Shanghai)
Nov 2 Brazil (Interlagos)

The season ends on 2nd November in Brazil.