I posted this in the other thread as well... Not intentionally spamming my thoughts, just felt it would be appropriate to post here too.
First off - THe XP downgrade rights are very misunderstood by the consumer.
In order to understand downgrade rights, you first have to understand what the COA (Certificate of Authenticity) on the bottom or back of the machine grants you. Any machine that runs windows, and purchased via a large manufacturer like Lenovo, Dell, HP, etc requires a COA. The COA is considered the base hardware license for windows that follows that machine till it is sent to the pc graveyard.
Under typical licensing in the corporate environment, a COA has to be present even if your company has a volume license holder/Enterprise Agreement/software assurance with Microsoft. The ability for a company, school, etc to install windows with their own native install from scratch is considered an "upgrade" by Microsoft. Now, point to make - the volume licensing is cheaper per seat than a retail copy of the same OS... That's why when you buy retail XP/Vista or if you buy one of the system builder or "OEM" copies off of new egg, it has a different cost structure.
So, along comes Vista, and under standard MS licensing terms, a Volume install of XP would typically not be legit even with the Vista COA. MS amended the rules for that and made an exception for downgrading to xp and still being compliant with MS licensing terms.
This downgrade offereing was primarily and still is targeted at businesses that still want to run XP. Unfortunately, the consume felt they also fell into the same boat.
The mistake made by consumers is in assuming the the downgrade rights grant them a free copy of the XP install for that PC. It does not. A consumer who has a full retail copy of XP or system builder copy doesn't even fall into the downgrade rights category anyway as those are considered fully licensed stand alone installs based on their price structure.
So, if a consumer wants XP instead of vista, they can call the vendor they bought the system from, and that vendor will charge them for the XP recovery media, and shipping.
MS and the vendors are doing absolutely nothing wrong here. The only thing wrong is how little people understand about that dang COA.