I've been a big fan of stuff like this Louis guy for as long as I can remember. Rossman himself came to my attention a few years ago, and I regularly check back in to see the utter strangeness he puts out there while fixing things the hack and slash way...or as he would put it "scrapy scrapy, just the right amount of flux."
Cody's lab is great too. Refining uranium is no joke.
Any other good and theoretically useful tech oriented stuff you guys know about?