Where can I find sites for archived SYNOP, METAR, TAF data etc?

There are a growing number of sites that fit the bill: the ones listed below are simply a selection that I use routinely. Some will archive data for limited periods (say a month or less), others longer.

[ rolling archive of European SYNOP's ]

[ archive of METAR's, TAF's, SYNOP's etc., both coded & decoded ]

[ archive of coded data, including upper air ]