There is a nice repudiation by Tamino at Open Mind [1] of the current round of stories announcing the "cooling trend" in global average temperatures. (Thx Jim Eager for noticing.)

Tamino concludes that the deniers are right: it was cooler in 2008 than in 2007 - which is a variation - but inexorably warmer over the last century - which is the trend.

When people ignore this longterm direction, choosing instead to pick the high point (perhaps 1998) and then claim a decline in average temperature, Tamino keeps an open mind about whether that is a reflection of dishonesty or stupidity.

In this, however, stupidity should not be a defence. It's bullshit, even if the liar is delusional rather than dishonest.