In Text Advertising is a great to increase revenue for your blog. There are plenty of types of in text advertising that might be suitable. There is often the debate whether in text advertising simply turns off visitors enough not to revisit your website. I’ve used intext advertising for months without a problem. I’d suggest trying it out and if you notice major drops in traffic, then of course naturally removing your in text advertising.
Kontera – I’ve used Kontera for plenty of my blogs, yet they seem to pay out quite low, as low as .02 cents per click.
Intellitxt - I’ve never used Vibrant Media’s Intellitxt simply because they have tough restrictions to being accepted into their ad program.
Amazon Associates - Another text link ad program, but rather than pay per post, associates earn up to 10% in referral fees on all qualifying revenue made through their links.
Adbrite - I had plenty of problems, but when Adbrite works, they pay quite well. Definately worth a try if it works for your site. They offer also other pay per click solutions including banner and text link ads.