This is a question many bloggers ask and it is my opinion that done correctly it won’t hurt your blog at all. Let’s face it most people understand that bloggers also have to make a living and so they expect to see ads on the blog. As long as you provide good and interesting content there is no problem displaying ads on your blog. Saying that I would stay clear of pop-ups and such as many people find this annoying, I know I do.

I would recommend keeping an eye on how the ads are performing and change those that are not generating income. Rather than having hundreds of ads that do nothing for you except increase the amount of time it takes your blog to load it’s best to concentrate on the ones actually making you money.