Im thinkin more people than you realize have popup blockers, theres lots of computer nerds, every computer nerd I know has popup blockers, then theres the AOL, Compuserv, Earthlink, etc users that software comes with pop blockers now, then theres the percent that go out of their way to get a pop blocker, then theres those who use mozilla, opera, etc w/ popup blockers, then theres those who get the google bar
Dunno a percent tho..