Having just read a farcical thread on /. (gotta love the Americans for having some of the best and some of the worst coffee in the world, yet everyone is a connoisseur! ), I noticed a weird recommendation for the Toddy coffee maker which purportedly recommends cold brewing (for 12 hours!), resulting in a concentrate that "may be refrigerated for up to 14 days without any deterioration in taste or freshness." Apparently it's popular in New Orleans, but the exact origins are uncertain.
So. whilst I'm sure that people around here will be surprised to hear that I'm cynical... has anybody actually tried it? I'm sure one of our budding chemist/experimenters will have fiddled with this. Time for us all to dump our PIDS and save on electrical bills?