I rely quite a bit on Wikepedia (probably as much as I used to rely on Britannica, if truth be told), since it's a nice, one-stop-shopping resource for loads and loads of facts on any given topic, albeit with a nontrivial margin of error. But I use a million and one resources for quick and dirty translations, most often recently involving translating Chinese ideograms into French, and then from French into English, before finally cracking the spine on my Oxford Chinese to English dictionary when all other methods fail. Imagine my delight as discovering Wiktionary. It's quick and dirty, it's one-stop-shopping, and it's probably got a healthy margin of error. I'm in love!