However, if you are slightly critical on the whole matter, here's the tumblr of a 2nd-year Politics student who rhetorically questions whether the money collected should be spent on victims, etc. Please do check it out, the author provides some thought provoking arguments.
Please just take half an hour of your day to watch this video which will hopefully inspire you to take action. I know in London there will be a 'Cover the Night' campaign on 20th APRIL 2012, where at sundown, people will meet at St Pancras Station to collect the posters and spend all night pasting them on every street corner in London. The same events will take place in the majority of major cities in the world, so search on Facebook events to see if this will take place in your city.
Also, here's the official website where you can join the mailing list and make a monthly or once off donation (paid in dollars).