Let's take a quick look at the google adsense program and see why it's so perfect for bloggers looking to make money online... Amongst many other things, google does two things exceptionally well - classify sites for it's search engine results and offer advertisers extremely targeted advertising. I say extremely targeted because it's focused not just by topic or niche, but right down to specific keywords and keyword phrases!
And as the largest, most-visited search engine online, google covers every legitimate subject you can conceive of - and has found advertisers for most categories... And to be able to provide even more exposure for their advertisers, google not only shows those ads on their own search engine results pages, but allows other website owners to display the ads as well, splitting the advertising revenue with those site owners.
And you, as a blog owner, can enjoy the benefit of their efforts and start making money online with adsense-enabled blogs starting today! Read through the terms of the adsense program, complete your application into the program and then use the google adwords keyword tool to see which terms draw the most traffic in your niche. (as a blogger you're probably already doing just that anyway...) Just to make sure there are advertisers for your particular topic, do a search for your topic on google - do ads show up above and beside the results? Then there are companies paying to advertise in your niche - time to get your share of that revenue! And the easiest way to get started making money online with google adsense is with an adsense-enabled blog using best themes.
Best of all, you can blog about the issues or hobbies that interest you - you can choose just about any subject to write about, so be sure to pick a topic you enjoy! And your readers won't find google ads intrusive, since they're targeted to the same information that brings your readers to your site in the first place... They're looking for the information your blog addresses, plus you're showing them links to more info and resources on that same topic - a win-win situation!