Fast Search & Transfer (FAST) today launched AdMomentum, a private-label contextual advertising platform. The product targets online media companies, retailers and telecommunications service providers, offering a way to monetize traffic to their sites.
The platform offers publishers the ability to sell ads either locally or nationally; provide a self-service environment for their advertisers; and pick from multiple ranking algorithms and customer interfaces to meet the needs of both their audiences and advertisers.
I haven't had a chance to dig deep on the platform yet, but it appears similar to offerings from Quigo, or Marchex's IndustryBrains. Miva and ValueClick are among other PPC providers that have customized implementations for larger advertisers, but do not have a mass-market private label program.