I recently transferred my HD from my PB to my MBP 15.4" 2.16 using the transfer utility. Most applications, like the Adobe ones, required me to re-enter serial numbers. Some stopped working. Office now has the same serial code, since it didn't ask for a new one, and thus can no longer be used simultaneously (fortunately I'm wiping my PB HD). Which brings me to my next point. I had Tiger running on my PB G4. I tried to use the recovery disks from the MBP package to reinstall Tiger on the PB, and it failed. It wouldn't even boot properly from the CD. I have another copy of Tiger that I bought which I'll use, but still, is this inherently wrong? Couldn't I have just used the MBP CDs and entered my legit Tiger serial? Also, any advice about wiping my drive so that no remants remain (i.e. so I can sell it).