To be honest I only barely understand all the concepts behind bitcoin but it seems like a great idea. Since people have suggested real monetary donations in the form of paypal before, and I have a real career that earns me more money than kernel hacking likely ever will, I've refused. However, I'm quite happy to accept bitcoin donations. So here's my bitcoin address:
For those who have not heard of bitcoin, it is an online currency not underwritten by any country but by mathematical computations. It's an interesting concept where the currency itself is slowly increasing in value as the amount of "coins" "generated" decreases with time. You can convert real money into bitcoins, and you can currently purchase a few things with them. The number of services and products you can buy with them is increasing steadily. One bitcoin is worth about 18 USD at the moment. You can actually "mine" for coins by work in the form of CPU or GPU power, which is a perfectly valid way of generating "money" but the ability to generate these coins gets harder as time goes on. Currently, mining for coins with CPU power is unlikely to generate any coins directly unless you join a pool, as it would take 50 years to generate them with CPU power. In a pool such as http://ozco.in (which I use), a modern CPU will generate about .01 coins a day. However, GPUs (and more so ATI ones) are much better at this mining. See http://bitcoin.org to learn more about bitcoins.