Webwork - 2:16 pm on Aug 9, 2010 (gmt 0)
Whitey, the issue is a bit of "grasping and squeezing mercury".
I've read/heard the Oracle of Search Spam endorse links from "quality directories" and, if memory serves me, he specifically named Yahoo.
OTOH, given the shifting winds of the ranking algo - and the user-effects of the ever evolving "assembly and configuration of the SERPs 'on screen'" - the best anyone might offer is test-test-test.
Of course, those who were awarded a "SERPs A" this month, for successful test taking efforts, may fail the SERPs class miserably the following month. :(