recently I stumbled over a new service called Flattr (https://www.flattr.com). Basically it is pretty much like the "I Like"-Button from Facebook with a integrated Micropayment service.
This video explains very well how it works.
So the idea is that you can show you appreciation for others who posted a good tutorial or a helpful answer, but flattering them. So you can encourage them to post even more tutorials and more even better anwers.
Think about it

As you can see at the top of this post
The service is currently invite only, but I have a couple of invite-codes left

Best Regards,
Nicolas







