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Does the mention of a "PPC component" indicate that your foremost concern is driving traffic - not simply "getting a link"?
if i might ask, do you have a site in business.com and does that site enjoy decent traffic from business.com ?
there are a lot of direcotries out there, but the only ones i think generate some traffic are the web counterparts of established yellow pages.
failing that, there is always the Se's
Webwork: Yes - nearly any business would (and does) consume these products. It's difficult to answer both you and Centime in the same thread. I'm looking for links that provide relavancy in the eyes of the SEs, and/or a PPC platform to supplement campaigns with the SEs.
Centime: business.com provides decent traffic through PPC. Doesn't pay the rent but keeps the cleaning lady in vacuum bags. Lot's of bags :)