Since October 2003. 160GB HD, 640MB RAM, 1Ghz. Combo drive.
Mine's fine for most everything, although it's certainly slow when dealing with 10 megapixel pictures in iPhoto, uploading those pictures through USB 1.1 (full 1 GB card took about 45 minutes), playing Civ III, switching around when I've left 6 programs and 20 web pages open...
Another problem is the screen started being excessively flickery about 6 months ago. It's OK on 1024x768 with the higher scan rate (89 Hz), but on 1280x960, at 72Hz it's quickly headache inducing.
Just got a video camera, and eventually not being able to burn DVDs will be another serious limitation. Computer can't run Civ IV or Sims II, which would be fun. But, with a baby on the way, playing video games isn't really a priority.
I'm hoping that this computer will last until January 2008, in time for iLife '08 and the new Quad Core 3.0 Ghz iMac or Super Mini.