Interesting discussion here. Here is my take. If Apple truly wanted to prevent anyone, who bought a Mac before Oct 1, from taking advantage of the $10 Leopard upgrade, they would have pre-programmed the online store to recognize only those serials numbers that fit the parameters. Surely, this is possible. Could they not be simply giving the early iMac purchasers a bit of a deal, although an unadvertised deal, realizing that releasing a new iMac, just several months before releasing a new OS seems a little strange? Just my opinion.