This is going to be essential for taking the guesswork out of the bid increases on PPC campaigns.
Here's a on the Adwords Bid Simulator..... here is a on the details.
The next step IMO - is tying the visitors predicted into the Google Analytics goal metrics (like goal conversion rate and per visit value)to predict leads/purchases/revenue for increases in ad spend.
This will allow us to give a decent idea of the ROI for PPC spend increases.
Neat eh?!