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I don't know whether they're an idea who's time has come, or whether they're not yet ready for prime-time... but it would be interesting to have a place to discuss them.
The topic may not be able to sustain a forum, though. There's nothing worse than a forum with no threads. Maybe the topic could be local/regional marketing and search.
Looking at it optimistically, the development of local/regional search on the web might be analogous to that of cable TV... which was essentially a wasteland until the market became large enough that some of the cable channels became networks on their own.
There is a whole different strategy for purchasing/getting listed in these IYP's, than in regular directories. One of the major differences is that you need a physical address to be listed(generally).
I think local/regional marketing and search like Robert suggested might be a good solution.
However, I think there is enough non PPC advertising questions to split the Advertising Sales and & affilate forum into two forums.
Affiliates are numerous around here, and will easily support it's own forum.
If you took the advertising questions from search engine promotion and adv/aff sales, along with the growing IYPs and advertising in Directory questions, you could support a forum for non ppc advertising.