QUESTION :
I would like to upgrade my iMac which is running now 10.5.8 to 10.6.4
Can somebody point me to some articles discussing about Mac upgrades?
ANSWER :
Lifehacker has a good step-by-step guide on upgrading from Leopard to Snow Leopard.
You will need to purchase the Snow Leopard upgrade DVD from somewhere that sells Apple software. Usually it is around $29 US.