Have you considered Adbrite as an alternative income source for your blog in addition to Google Adsense. Adbrite is very different from the Google adsense you see around several websites.
Adbrite is Simple.
Use AdBrite to set your own ad rates, and approve or reject ads that are purchased for your site. AdBrite enables you to instantly sell ads to your visitors via a “Your Ad Here” link, in addition to selling through AdBrite’s marketplace and sales team. The income earned is split 75/25 in your favor. Just place a small mall snippet of HTML placed on your site, and they take care of ad serving, scheduling, billing, customer service, and sales.
Adbrite with Adsense
There was a lot of forums reporting that adbrite could not be placed alongwith Google Adsense ads as it violated Google Adsense policies.
“We do not permit Google ads or search boxes accessing Google search services to be published on web pages that also contain what could be considered competing ads or services. If you have elected to receive contextually-targeted Google ads, this would include all other contextually-targeted ads or links on the same page as Google ads. This would also include ads throughout the site that mimic Google ads or otherwise appear to be associated with Google on your site.”
Webmaster World has an extensive discussion on the issue and they came to the conclusion that Adbrite works with Adsense.
Realizing the issue, Adbrite published that publishers can turn off AdBrite’s “run-of-network ads”, and then AdBrite will only display ads approved by you. If you have no paid ads running, AdBrite will display a banner showing “Your Ad Here” only, So advertisers can use Adbrite ads in addition to Adsense
Google Adsense probably pays the most. But Adbrite is a good alternative – its just that you have to wait for sponsors, unlike Adsense. Adbrite works with Adsense, but remember to use the option where you directly sell ads and not display contextual network ads.