Last time I advocated splitting campaigns into Google.com only and Google + Syndication, particularly for your highest traffic terms.
I got a lot of great feedback on that piece so I thought I'd provide some more data on specific Google and Yahoo partners. Obviously the mix of clients we have may impact the relative size of different partners, but this is what we see.
On each of the charts I show the fraction of Network Costs and Sales each site represents for our clients, and the relative "quality" of the traffic (1.0 = average for the network)
Data junkies: Enjoy!