Made a small statistics out of posts and views of official threads. That should somehow reflect actual interest in particular events. Take it easy, it's just numbers mokin:

First statistics according to views of official threads (Safari is not counted as it had no separate thread):

1. Norway (WRC) - 81003 - two threads in fact because of locked first one
2. Monte Carlo (IRC) - 76024
3. Walles (WRC) - 69087
4. Finland (WRC) - 58335
5. Ireland (WRC) - 57294
6. Portugal (WRC) - 56843
7. Barum (IRC) - 52549
8. Acores (IRC) - 52259
9. Ypres (IRC) - 47933
10. Cyprus (WRC) - 43788
11. Scotland (IRC) - 42088
12. Poland (WRC) - 41460
13. Australia (WRC) - 35501
14. Madeira (IRC) - 34869
15. Catalunya (WRC) - 32715
16. Sardegna (WRC) - 31166
17. Acropolis (WRC) - 28853
18. Asturias (IRC) - 26867
19. Sanremo (IRC) - 26072
20. Argentina (WRC) - 24600
21. Curitiba (IRC) - 19492
22. Russia (IRC) - 19224

Second according to number of posts:

1. Norway (WRC) - 1435 - two threads in fact because of locked first one
2. Walles (WRC) - 1285
3. Monte Carlo (IRC) - 1107
4. Ireland (WRC) - 894
5. Portugal (WRC) - 843
6. Cyprus (WRC) - 828
7. Australia (WRC) - 802
8. Barum (IRC) - 753
9. Acores (IRC) - 748
10. Finland (WRC) - 731
11. Ypres (IRC) - 658
12. Madeira (IRC) - 620
13. Sardegna (WRC) - 605
14. Poland (WRC) - 604
15. Acropolis (WRC) -579
16. Catalunya (WRC) - 564
17. Scotland (IRC) - 516
18. Asturias (IRC) - 433
19. Sanremo (IRC) - 432
20. Argentina (WRC) - 419
21. Curitiba (IRC) - 226
22. Russia (IRC) - 216