companies I will not do business with

Maxell	Rebate's don't always get fulfilled, even when every care is taken to make sure all instructions are fallowed. I believe they have a polity of rejecting a fixed percentage of requested regardless of validity.
ZipZoomFly	This company has very poor control over its inventory (They shipped out a refurbished hard drive instead of the brand new drive ordered), and then hopeless customer support that actively tries to make you unhappy, so long as it saves them money.