Amnesty International has a list of Good News (with a feed). That's nice, newspapers should have this sort of thing on their front-pages every day, it would give us back some faith in humanity... but I forget that the papers' job is to keep you distracted, dispirited and depressed, so that their backers (investors and advertisers) will keep screwing you.
There's also a Call To Action page (again with feed). Some things you might find silly ("demonstration" is such a XIX century concept), but you can choose your preferred way to help. For example, I have a credit card that will donate 0.25% of every transaction to Amnesty. It seems such a little thing, but it raised £1.5million in the last 15 years; that's an average of £100.000 donated each year, just by shopping! I've had this card since I opened a current account here in the UK, six years ago -- which was (by the way) with an ethical bank, Cooperative, so I know that my money will not be invested in producing or dealing weapons (among other things). Oh, and did I say that my ADSL provider's profit help developing Free Software?
There are ways to make a difference, day by day, voting with your wallet. I'm no hippie (fuck, do I hate vegans and home-recycling schemes), but in all my laziness I try to help good people, a little bit. I just got a big bonus, and I think it's time to pay back some debts to my parents; i know that they will be happy to hear that I want half the money to be donated to a charity. Eh, I'm a bastard ;)