From racing-live.com :

Reigning F1 Champion Fernando Alonso disagrees with Mark Webber's assessment that he will stroll to an easy second crown in 2006. But on the website of Canadian sports broadcaster TSN, 24-year-old Alonso is quoted as saying that the imminent battle is likely to be 'very close' and fought between Renault, Honda, Ferrari and possibly McLaren.

Haha - possibly McLaren ???

They were the only ones who could measure with the Renaults last year and if they had been more reliable, they would have beaten the living crap out of the Renaults

And I don't believe that Ferrari will be a big threat this year either, watch out for Kimi, Fernando !