I usually do organic SEO...now I'm going to do PPC. I have more than one client. Just wondering if I can use one campaign for one client and another campaign for another on the same account (which would be mine).
No, that would be extremely unprofessional and could turn out very messy for billing You need a client centre - http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=7725