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I have heard from contacts in Singapore that only Google and Yahoo matter in terms of local listings. Other than those it seems you would be looking at a very small share of an already small market.
The Taiwan market has a few more options. I don't know as much about that market's local PPC, but I do know that my mainland China sites get some traffic from Baidu and Sohu, both of which have PPC. Maybe some of our other members can give you other options.
Yahoo.com.sg offer their own solution: