A good friend of mine has a legit copy of Tiger that he bought for his 12" PB. Then his PB up and died on him and he got himself a new one.
My question is: can he legally sell me his copy of Tiger? Does it register under one owner once it's installed? Can I do this?
The only thing I can think of (outside the EULA) is that the disc may not work for your Mac--if it's a different model. There have been instances in the past (pre-OSX) that I've noticed the install CDs that came with the Mac would only install on that particular model. This may not be the case these days, but it's worth checking out.
Retail copies of Tiger install on any OSX-capable Mac. There are some versions of Tiger that are upgrade rather than full install, although I don't believe they were sold in Canada, they do exist. In that case you would need 10.3 on your system to run the installer.
I was asking myself the same question (whether it was worth upgrading to Tiger given that Leopard could be right around the corner) but I decided to go for it, and I really like Tiger. Its not a huge upgrade or anything, but its nice to be 'up to date', especially since I don't really want to be an 'early adopter' of Leopard (which should extend the life of my Tiger purchase). Also, if you're eligible for a student discount, its not all that expensive.
When my fist clenches, crack it open...