This topic on TT4 got me thinking.
I purchased my G4 (MDD) in August, 2002 along with the AppleCare Protection Plan. The TechTool Deluxe v2.5.6 that came with the AppleCare plan is not compatible with my computer. There is now a downloadable upgrade which allows me to use TTD in Classic Mode.
Today, I called AppleCare to ask if they had plans to give AppleCare subscribers an upgrade that is compatible with OS X. (I used that tactic on purpose.)
After some deliberating and waiting while the person talked with someone else, he came back with: "We will send you a copy of version 3 in the mail."
Obviously, it's good to speak up!