For current production components, SupplyFrame created a cool little widget that lets you pull up crosses, specs, sources and other useful information about 2.5M components. Avnet supplies some of the data too. Wont help you find obsolete stuff, sorry. But will probably save you time finding info on current stuff. It's free. http://www.supplyframe.com/gopart EETimes talked about it: http://www.eetimes.com/showArticle.jhtml;jsessionid=S0JTLFUWRPTUEQSNDLRCKHSCJUNN2JVN?articleID=197007263 My apologies if you interpret this as advertising - but this is a free tool designed for electronics designers. Thought you would want to take advantage of it.