ecmedia - 4:00 pm on Mar 7, 2008 (gmt 0)
Had a similar goal in 2004 and reached it pretty quickly by adding AdSense on two websites that I ran as a hobby for several years without advertising. Had approximately 25,000 visitors daily, though. In other words you have a tough road ahead of you unless your websites catch fire for some reason. I am 4X the income now even though the traffic has not grown 4X. In other words the web is a great place to make serious money provided you do the hard work.