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6. Can I sign up for more than one account?
This is strongly discouraged. Because website publishers can place the AdSense HTML ad code on any page they own or manage, there is no need for publishers to create multiple accounts. Therefore, we generally limit Google AdSense accounts to one per publisher. However, publishers may create multiple accounts if they manage sites that require separate payments.
This puts me in a tricky spot, and I don't really think that part of the TOS makes much sense, as most websites are their own and independent businesses, even if they are sometimes opereted by the same people.
Of course, Google probably has a record of what domains your ads have appeared on for your account. But why make it harder for the person who checks the index page for suitability ;) They probably wouldn't check for your original account unless you brought it up.
I'm a specialist in my field. I do my part in many projects, with the other parts done by different teams. I'll always be responsible to set up adsense, but I MUSt have separate accounting.