First off I'd like to welcome you to the board NeoSeo - it's good to see you over here
Always have recommended the Guide to getting a site to do well in Google in a year - although the actions recommended in that guide will probably work a lot faster these days
Surfn - I think that we all have our own experiences - mine happens to be closer to what NeoSeo stated - the other SEs only bring about 10% of the traffic to my sites - of course that may change in the relatively near future - and that includes the fact that Google is feeding most of the other large players right now so I count that as Google (Yahoo, AOL etc.)
Although an earlier post I made intimated that I dont get useful info over at WMW, that is far from reality - there is a ton of good info and especially if you can read between the lines of SE reps postings, you can garner some solid money making tips.
NeoSeo - there are still a few of us that use both methods
they have their place, with this side of the biz really built on niches, there are the mega affiliate sites that do well with what you use - some here put the shotgun method in effect on their larger link sites and then take the leftovers and filter it down to the niches.
Again welcome and don't be a stranger here - we can all learn from sharing our experiences whether on the adult or mainstream side