If you try to use all the "advanced" strategies on the 3.7.1.41 version of Brickbreaker, you should be able to get to (or break) 7000 in a few days. The key is to get as many "bonuses" as possible, use the gun to knock out blue bricks (and if possible metal bricks - lot's of points for those), and try to hit bricks with the laser ONCE before the ball hits them -- gives you an additional 5 points. If the stars allign, and you get enough guns, you should be able to break 7000. Best score I heard anyone claim in person is 7730. I heard someone in the media claim they broke 8000 (but I doubt it).

My best was 7060. Good luck!