I recently found this website, khanacademy.org which is a brilliant initiative by Salman Khan (not the Bollywood actor), an American educator who started this website with a mission of “providing quality education to anyone, anywhere”. He has also been one of the speakers on TED.
The website is a collection of video tutorials on a wide range of topics such as mathematics, science, finance and humanities. I particularly found the videos on economics and finance very useful. As of now I have just seen the videos on currency exchange but there are a lot more topics that could be studied.
With the IIM GDs and PIs coming quite a few people are educating themselves on matters of finance and economics. This could be a very good resource to start off with.