Below are top ten most commonly asked questions in regard of running Google AdSense program. A complete list of AdSense FAQs can be found on Google website at:
https://www.google.com/support/adsense/bin/topic.py?topic=135
1. Question: May I open two AdSense accounts?
Answer: No. Only one account is permitted for each individual, organization or even family.
2. Question: How many ads can I place on each page?
Answer: Three ad units and/or two search boxes maximum. For referral program, there is not limit of numbers.
3. Question: Can I click ads on my own sites?
Answer: Absolutely no. If you do, your account will be terminated and you will be banned forever by Google AdSense program.