In case anyone leaves their computer running overnight on a regular basis, you might as well put it to use. I did, and I've made ~ $200 in a month from it. Sharing this so others can jump on the bandwagon if they want. Enjoy!
http://bitcoin.org/
Basically you let your computer do some work while you are or aren't using it, if it helps find a block you get a tiny fraction of payout in bitcoins. To dumb it down a bit, imagine there was a huge math problem that needed to be solved, and whoever solved it would get $1000. You could try to solve it yourself or join with many other people and try. However if you go with other people, you will need to split the winnings. Bitcoin mining is kinda that. You let your computer solve problems, either by itself or as part of a group. If you find it yourself, you collect 50 bitcoins (which are ~$14 USD each right now) or if you join with a group you get whatever small %. The problem is that if you try by yourself, it may take years to be the first to solve a problem verses a group of 2000 people working together. So its up to you.
When you want to sell, there are several sites that you can goto, I've been using www.mtgox.com
Also a note on mining: video cards work MUCH better than your processor, so if you have an old video card or a bad processor, don't bother mining for bitcoins because it will actually cost you more money (in electricity) than you will gain from it, albiet you will only use like $2-4 dollars of electricity, you might only make $1 worth of bitcoins in a month.
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If you plan to start, feel free to mine on your own or check out some groups: www.btcguild.com is the group I mine with, but there are tons to choose from. The official Bitcoin forums on the link at the top are the best place to get started. If you have a good video card and want to start mining awesome and enjoy, if you want to donate some time to me (kinda like referals here) even better, and instructions are below, and when you want to stop and mine for yourself, make your own account (instructions at end). If you don't want to donate, just skip to the instructions at the very end.
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TO DONATE SOME TIME INSTRUCTIONS:
Here is the program that mines:
https://github.com/downloads/Kiv/poc...r-20110701.exe
(from http://forum.bitcoin.org/?topic=3878.0)
If you have windows, this is how to set it up.
#1) Start the mining installer and install it wherever you please.
#2) Start the program, a default window will come up, you will need to set it up based on what video card you have.
#3a) If you have an NVIDIA card, hit FILE --> New Miner ---> New CUDA Miner...
#4a) Call it Nvidia and then hit OK
#5a) Where it says SERVER, change it to BTC Guild
#6a) Where it says Username, change it to lostservant_mmo
#7a) Where it says password, change it to champ
#8a) Where it says Extra Flags, type -aggression=3
#9a) Hit FILE ---> Save settings.
#10a) That's it, your configured, hit start to start, and then that button turns to stop to stop.
#3b) If you have a Radeon card, hit FILE --> New Miner ---> New OpenCL Miner...
#4b) Call it Radeon and then hit OK
#5b) Where it says SERVER, change it to BTC Guild
#6b) Where it says Username, change it to lostservant_mmo
#7b) Where it says password, change it to champ
#8b) Hit FILE ---> Save settings.
#9b) That's it, your configured, hit start to start, and then that button turns to stop to stop.
Thanks in advanced to anyone know helps out! If you try to get this set up and something isnt working, let me know i'll try to help ya fix it.
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TO START MINING FOR YOUSELF:
1. Download the Bitcoin program from http://www.bitcoin.org/
2. Start the program and get your new Bitcoin address (its a LONG string of numbers and letters)
3. Set up an account at some bitcoin mining site:
For example
Goto www.btcguild.com
Hit create an account on left.
Enter a username and password.
Hit Change wallet address and copy your bitcoin address (from the bitcoin progam in step 1) and save it.
Add a worker by going to the "manage workers" tab on left, then entering a new working name and password.
After getting your bitcoin address and workers set up its now time to set up the actual mining program for your computer.
Here is a program that mines.
https://github.com/downloads/Kiv/poc...r-20110701.exe
(from http://forum.bitcoin.org/?topic=3878.0)
4. If you have windows, this is how to set it up.
#1) Start the mining installer and install it wherever you please.
#2) Start the program, a default window will come up, you will need to set it up based on what video card you have.
#3a) If you have an NVIDIA card, hit FILE --> New Miner ---> New CUDA Miner...
#4a) Call it Nvidia and then hit OK
#5a) Where it says SERVER, change it to BTC Guild
#6a) Where it says Username, change it to [your account name]_[your worker name] (for example, lostservant_mmo)
#7a) Where it says password, change it to [your worker password]
#8a) Where it says Extra Flags, type -aggression=3
#9a) Hit FILE ---> Save settings.
#10a) That's it, your configured, hit start to start, and then that button turns to stop to stop.
#3b) If you have a Radeon card, hit FILE --> New Miner ---> New OpenCL Miner...
#4b) Call it Radeon and then hit OK
#5b) Where it says SERVER, change it to BTC Guild
#6b) Where it says Username, change it to [your account name]_[your worker name] (for example lostservant_mmo)
#7b) Where it says password, change it to [your worker password]
#8b) Hit FILE ---> Save settings.
#9b) That's it, your configured, hit start to start, and then that button turns to stop to stop.