In response to those questioning the servicability of the iSight iMacs, you're spot on. I work at a third-party Apple retailer and service center, and have repaired more than my fair share of those machines. Not fun.
The innards of the iMac G5 (20-inch) and iMac G5 (20" ALS):
And finally the innards of the iMac G5 (20" iSight):
Now, these are screeners from my service manuals, so please excuse the bad quality, but I think many of you might get the picture. Not to mention, that 20" iSight picture is AFTER the hard part, which is just getting the front bezel off. You need a pair of credit-cards (or equivalent plastic shims) to jam into the rear fan just right to release the clips, at which point the bezel comes off. Easier said than done, I assure you. After that, comes the tedious task of carefully unsticking the EMI shielding tape that covers the inside of the entire "chin" and goes around the outside of the LCD. Again, bleh. After that comes the journey of inserting a T10 driver into a tiny hole, unscrewing and magnetically retrieving a screw through a hole that seems smaller than the screwhead itself. And that needs to happen successfully about four times before the LCD comes off. If you slip up and loose the screw from the end of the driver, good luck getting it again. Continue to remove the panel and look around for it after you can actually see.
I absolutely love the internal design of the pre-camera iMac G5's, however. Every part of that machine can be easily accessed in about 10 minutes, which is very short for the compact design.
All in all, for a tech anyway, no-camera > camera.