How many Ads units per page are allowed ?
I'd start with Google Adsense - However I'm unsure of exactly how many Ads I can actually have per page. I'm guessing it's OK to mix and match banners with say ads blocks, etc, So what is the maximum total number you can have on a single page?
Answer- 3-4 Ads is better.
Please keep in mind that a maximum of three standard ad units, three link units, and two search boxes may be placed on one webpage.
In addition, please be aware that every publisher is responsible for the content of a website on which their ad code is placed. If a website is found in violation of our program policies, we will notify any publisher(s) whose ad code is on the website, and ask you to remove the Google code from that page.
Currently, AdSense publishers may place up to three AdSense for content units on one webpage. This includes a maximum of one 300x600 ad unit per page. You may also place a maximum of three link units and two search boxes on each webpage.