youtipit.org is a great Flattr-like service, except that it uses bitcoins. You can still provision your account using Paypal, but it will be converted into bitcoins and you'll be "tippiing" people with bitcoins. And of course, when someone tips you, you'll get bitcoins, instantly. You can choose to "tip" someone else with them, or withdraw them to your regular bitcoin wallet. I think this service is really a great news.
I just discovered bitcoin.org. I think it's a great system, and I can't wait to try it with actual transactions. The only problem is there's no package for Debian yet. I'm curious to see how it will grow and how it will deal with some financial problematics: devaluation factors, and all the stuff. I'm also very curious to see how major financial actors, including governments, will react, whether they'll try to break it, to manipulate it, or to just jump into the game.