Today I too had six tiny lines appear in a random placement around the screen, and they did "grow" throughout the day (at an unequal pace!) parallell to one another, from top to bottom of screen. Right now the longest is nearly an inch! I have not yet plugged in a charger to see if they go away, as another said. I'm on the stock ROM (Kobe 2.2.1 from Motorola) but going to install CM7 probably tomorrow. I figgured that would make it go away, but another said he was using a mod already and it was still happening...
So, did any of you guys who've had this phenomenom had it go away permanently? Or did it eat up the screen? Is it a virus that I can wipe with AVG or some other Android anti-virus app? I've noticed it being extremely slow lately, and placing a call requires about a 15 second delay before connection...which is totally unaccetable! Sound like a virus??

Motorola Bravo MB520 on 2.2.1 Kobe stock (this was the official Motorola update from the original 2.1 that came on the phone when new)