For those of you who like your intellectual stimulation in double espresso sized servings then you are going to enjoy TED.
Among other things, check out Steven Pinker on why the 21st century is the most peaceful time in human history, and African journalist Andrew Mwenda on why development aid is a bad idea (he got into a row with Bono - who was at the talk - over that one!).
It's not all heavy btw: there are some amazing artists, designers and performers for your entertainment.
One of those "isn't the internet wonderful" kind-of-sites.