This morning, and its still the morning, we talked about GERPs, well, later in the morning, I found a DigitalPoint thread that is named approx 41% of screen real estate is adwords now. Basically, he broke up his screen into segments, based on a screen resolution of 1280x1268;
1) Top sponsers listings, 1265x170 = 215,050
2) Side Sponser listings, 308x590 = 181,720
3) Actual Google Results, 958x593 = 568,094
Based on his computations, he comes up with 396,770 total ad space in pixels and 568,094 total organic space results in pixels. So about 59% organic pixel space and 41% ad pixel space. Based on what fit above the fold of the 1280x1268 resolution monitor. Also based on returning results with three ads at the top of the SERPs.
The forum members are debating if this is a good or bad thing. Forum discussion at DigitalPoint Forums.