You can add another source of income to your blog by adding a "donate" button. This is for your loyal users who appreciate your posts. If you are uncomfortable doing this, another way to recieve donations is to contribute a portion of your donation proceeds to your favorite charity (make sure your readers know this!). Make a nice looking button and link it to a paypal account. This can easily be done by going to paypal.com and clicking on the resources tab. Scroll down and click on the donations link. It is pretty user friendly. Good luck!
I agree with Freedombreather. Not only is it simple to do with paypal, but it can be effective as long as you have useful and updated content. Great suggestion!!
I always wondered if people with donation buttons actually get enough donations to at least cover expenses. To the OP, you don't have to give specifics, but I assume you have experience with the donation button, is it worth it if you have a good blog? What type of blogs and websites does it work best on, in your opinion?