In General has come out with a smart way of using pop up ads. They realised that when a pop up ad is served when the user signs in, his interest is more on seeing his new mails than on the pop up ad. Most times, he simply closes the popups. Now programmers have worked out a better strategy. When the user selects a few email to delete, then a pop up ad throws up. Nice idea, ‘coz the user anyway waits doing nothing while the mails are getting deleted. At this time, the user pays atleast some attention to this pop up. Wise thinking, I’d say.