Got this email today... It goes on a bit more but that's the just of it. Why would I get this and are they asking me to move?
DFP SB is an adserver you can use to run multiple networks in competition with AdSense. If you are signed up with AdSense and at least one other network, I would highly recommend this. DFP gives you the flexibility to set eCPM's, frequency cap, geo target and many other ways to target your ads to users. Furthermore, your AdSense ads are always in competition with your other network(s) in REAL-TIME so you actually get better AdSense rates. I've been using DFP for about six months and I could not live without it. My revenues have gone up 50% after I switched from hard-coding AdSense codes to running them through DFP. Any more questions, feel free to ask!