I'll second your suggestion Seclinix. I've done pretty well so far with AdSense. Certainly I haven't replaced my paycheck yet
but my main web site is getting close to 200 pages, so the more pages = more ads.
Some folks are reporting better click throughs when they place images near the ads. Be very careful in doing this. Google has very strict written policy on how to do this legally. There must be a border around the image and you must always be careful not to encourage your readers to click on the ad.
Best policy with AdSense is always to refer directly to the TOS (Terms of Service) agreement with Google when trying a new method with the ads.