CNET

Important new KB articles: Security Update prevents reinstall of OS X 10.1; more

We assume this means that when a 10.1.1 update (or whatever the next update will be called) comes out, you will not be able to install the update unless you have previously installed this Security ...
CNET

Why Apple says to erase your drive before reinstalling OS X 10.1 over a Security Update

Thomas Koons received what we hope is the "final answer" on the question as to why Apple recommends erasing your drive if you want to reinstall Mac OS X 10.1 after installing the Security Update (see ...
Ars Technica

Trying to erase a drive and reinstall OS X.

Recently my daughter purchased an early 2011 13" MacBook Pro. The seller reinstalled Snow Leopard with updates, and then upgraded it to Lion. Unfortuantely, some of his user info keeps popping up in ...
AppleInsider

Apple now selling $69 Mac OS X Lion USB Thumb Drive

For those who don't want to purchase Mac OS X 10.7 Lion from the Mac App Store for $29.99, Apple is now selling the $69 USB install drive in its online store. Buying Lion on a physical medium from ...