Tin has rocketed up in price, charting a 66 percent increase from December 2005 to December 2006. A lot of this is fuelled by the enactment of RoHS legislation that require no lead in certified products. Since solder has traditionally composed of a lot of lead, 96 percent tin-based solder is the new, RoHS compliant solution.
Parts are starting to hit end of life (EOL) as they are replaced with RoHS approved substitutes. That means if your have a 1992 VAX with lead circuit boards you may be SOL, PDQ. And with peak copper and peak gold just around the corner, peak tin will give you just another reason to care about WEEE in IT.
Buy metals, young man.