TED is a nonprofit website bringing together people from three worlds: Technology, Entertainment, Design. Here you can get videos on different topics and in different accents.
It is great for those who need to work on listening skills and those interested on learning more without really noticing.
TED offers, along with the videos, transcripts of most of its conferences as well as subtitles in 28 languages.
As a start I’d recomend STEVE JOBS commencement speech or J.J. Abrams. Start with one per week and you’ll see your English go up easily! Give it a try: http://www.ted.com/