Personally, though, I worry about two things...
1) Between the economy and the overall performance levels, I wonder if we aren't going to see a slowdown of the recycling of post-2001 era hardware. I know my company and my customers seem to have no issues with running PCs that are more than five years old.
2) Between the TiBook mechanical issues, iBook G3 video issues, a similar iBook G4 issue, MDD power supply failures, G5 iMac capacitor issues and G5 watercooling failures, I wonder how many older Macs will make it to the recyclers (and to people like us) in any sort of usable condition?
John