it seems when theres a dual monitor setup with both digital and analog hookups, the identity # of the digital monitor is by default set to 1, regardless of which monitor is set as the primary. in windows 7 id#1 is labeled as the computer and id#2 as projector. for now there doesn't seem to be a way of changing the setting. digital is like a dominant gene over analog in the dna of windows 7.
if it's really bothering you the only solution would be to get a video card that supports 2 digital connections. the onboard geforce 8300 on my asus m3n78em motherboard has hdmi, dvi, and vga outputs, but doesn't support 2 digital connections at the same time. i threw in an old asus gts250dk that i'm not really able to use because after a couple days of use, reason unknown, it dies out. for the time that it did work however, i was able to correctly identify my monitors, and i have to say i enjoyed seeing the proper labels hehe.