Adsense

High quality content for your website, whether it is designed for Adsense, or as a general content site with other monetizing techniques, will not only attract visitors, but will get you good listing placements on the search engines.

Content makes your site more valuable to visitors and so more attractive to the spiders. Placing articles relevant to the theme of the page is a great way of providing this content.

There are a number of ways of finding articles, the most common being:

Write Them Yourself
This is probably the best way, if you have the time and the ability.

Hire a Writer
This is good, though it can be expensive to have someone write original articles for you, and many of those I have seen are less than perfect with regard to literacy.

Generate Them with Software
There is software available, some expensive, that can generate articles for you. I own a few different ones, and do you know what? I end up having to edit most of them to make them read right for my keywords, and there are long strings of identical text in every one. Duplicate content!

Get Them Elsewhere
You can get articles from article directories, but to avoid breaking copyright law, you have to include the writer's 'resource Box' which contains his website URL. This gives the writer a link back to his site from your's. Not only that, but how many others are doing the same? How many more websites is this article on. Are you putting duplicate content on your site?