Questions When Hiring An SEM Firm

Over in our forums, the Outsourcing SEM FAQs – Be Prepared to Answer! thread
gets kicked off by forum moderator Nacho Hernandez with a variety of questions he thinks those seeking to hire an SEM firm should ask. Work for an SEM firm and have your own
questions you think clients should ask? Drop by and add to the list. Have you hired an SEM firm (or two, or three)? Even better — come contribute the questions you ask!