I was recently lucky enough to attend a TEDx conference in the UK. TED is an internationally recognised conference phenomenon which holds events all around the world. TEDx is an extension of that, involving additional events that are independently organised but still under the TED banner.
Talks at TED events, which usually last around 30 minutes, cover everything from technology to art to medicine to music. And almost all of the talks are available online for you to watch at your leisure, free of charge. Right now, the site at www.ted.com/talks has almost 900 talks available. So next time you've got a few minutes spare, and feel like being inspired, head over to the site and pick a topic.