Bitcoin is an internet currency and payment system that was created as an opensource (ie voluntary, non-proprietary) project by progammers with anarchist leanings and based on a peer to peer model (ie BitTorrent) not dependent on any company, bank or government.
In that respect bitoin challenges the power of bankers and in my opinion is revolutionary.
From a users point of view its very simple to use. Heres an introduction video.
[ame="http://www.youtube.com/watch?v=Um63OQz3bjo"]What is Bitcoin? - YouTube[/ame]
From an anarchist/libertarian point of view, Bitcoin is very interesting because:
1) Its outside the control of any government, company or bank. There is no Bitcoin company. The project is managed by volunteers. No one can change or corrupt the currency without the agreement of the whole community.
2) It is borderless, operating all over the world. If one government tries to ban it, it will continue to be used in the rest of the world. In any case, a ban would be impossible to implement.
3) There is no inflation in the supply of the currency. The total supply of Bitcoins is 21 million. Once all the coins have been put into circulation no more can be created.
4) It is fairly anonymous. There is no account with your name and address on it. You just install the Bitcoin software and you can start sending and receiving money.
5) Your accounts can never be frozen or locked, unlike credit & debit cards, Paypal, bank accounts etc.
6) Bitcoin is similar to cash because its portable and concealable. You can keep a million euros of Bitcoins on a USB stick under your mattress or you can divide it between multiple electronic wallets, PCs, smart phones, online accounts etc.
So far, Bitcoin has mainly been a toy for geeks and is not yet widely accepted by merchants but this is changing rapidly. Bitcoins value floats on the free market and is determined by supply and demand. Its value cannot be manipulated by insiders, banks or governments. This incorruptibility has allowd the value of Bitcoins to increase from less than $0.01 to $5 today.
You can get Bitcoins by buying them on a currency exchange like MtGox.com or selling goods and services and asking for payment in Bitcoin. There are also people in Ireland, selling bitcoins for cash if you meet up with them. You pay them euro notes and they transfer bitcoins to your computer or smartphone.
You can donate to the occupywallst movement by sending bitcoins to this address - 1Q7DQVTubbUqr5by2YoZJRKCEzj9D3LQ9w
And you can donate to the feedtheprotest.com by sending bitcoins to this address -