For those of you interested in solar-climate connections, I strongly recommend reading DamonLaut2004.pdf from which one may quote gems such as: Analysis of a number of published graphs that have played a major role in these debates and that have been claimed to support solar hypotheses [Laut, 2003; Damon and Peristykh, 1999, 2004] shows that the apparent strong correlations displayed on these graphs have been obtained by incorrect handling of the physical data. The graphs are still widely referred to in the literature,and their misleading character has not yet been generally recognized. Readers are cautioned against drawing any conclusions, based upon these graphs, concerning the possible wisdom or futility of reducing the emissions of man-made greenhouse gases. In particular the analysis of Eigil Friis-Christensen and Knud Lassen's 1991 Science paper is interesting.
Thanks to Thomas Palm for pointing out the link, over on sci.env.
2020 update: see-also 2007's The Use of Damon and Laut.