Info from the BBC:

2008 dates

Date Rally
25-27 January Monte Carlo
8-10 February Sweden
28 February-2 March Mexico
27-30 March Argentina
24-27 April Jordan
16-18 May Italy (Sardinia)
29 May-1 June Greece (Acropolis)
13-15 June Turkey
31 July-3 August Finland
15-17 August Germany
28-31 August New Zealand
2-5 October Spain (Catalunya)
10-12 October France (Corsica)
24-26 October Japan
28-30 November Great Britain