you can read and download the update here :

http://www.apple.com/downloads/macosx/apple/macosx_updates/macosxv1062updatecombo.html

i choose combo update because it full, you can use it to update from 10.6.0 and 10.6.1. How to update:

Download the update n install it. but don’t reboot yet. if you are using sleep enabler you have to remove that kext and install sleepenabler.kext for 10.6.2. you can get the file here. make extension.mkext and you are ready to reboot  and enjoy your 10.6.2 Snow Leopard.

Netkas have make a good tips/release for 10.6.2 you can read it here

if you are using AMD/Atom you need to make sure that you have change the kernel because 10.2.0 kernel cant work with intel ATOM, AMD and non vanilla kernel user.

for ATOM user you can use 10.0.0 kernel or a patched 10.6.2 kernel : maybe you can use this kernel

for AMD user and non vanilla kernel user you can still using test7 kernel or Qoopz “anappirtrvh” kernel. its based on 10.0.0 kernel.

Update : Now nawcom have made a 10.6.0 and 10.6.2 XNU based kernel, he build it from qoopz resource and fix some code, you can get the kernel here. (still lack of cpuids patch for AMD)