The climate story of the decade is that the 2000s are on track to be nearly 0.2°C warmer than the 1990s. And that temperature jump is especially worrisome since the 1990s were only 0.14°C warmer than the 1980s (see datasets here). Global warming is accelerating, as predicted.
The UK’s Guardian, on the other hand, believes the big climate story is “2008 will be coolest year of the decade*.” The deniers have begun pushing this meme, as Greenfyre notes here. [Even that meme assumes the decade began in 2001 -- since 2000 was quite cool -- a view mostly shared be the few dozen people who didn't celebrate at a millennial New Year's party December 31, 1999.]
Climate is about long-term trends. Perhaps the most interesting fact is that 2008 is on track to be almost 0.1°C warmer than the decade of the 1990s as a whole – and warmer than any year of last century beside (the El-Ni±o-enhanced) 1998.
The decade of the 2000s — 2000 to 2009 — will almost certainly be the hottest decade in at least 2000 years (see “Sorry deniers, hockey stick gets longer, stronger: Earth hotter now than in past 2,000 years“):