If you don't know already, you could be making some extra cash with your bog!
Just sign up for adsense from Google at this
link.
Create the style of ad that you want, paste some code into your template and that's it. Now you will probably not get rich from it but it can certaintly some extra $$ is nice.
Have any questions, ask them here and we can help out since we have been using adsense extensively on some of our sites with a lot of success.