Acer
1. Buy a qualifying PC running Windows Vista from June 26, 2009 through January 31, 2010.
2. Order your Windows 7 upgrade, which sends you to a third-party Web site to register.
3. Your upgrade will be mailed to you after Windows 7 becomes available.
Check out the full details here: http://www.acer.com/windows7upgrade/
Asus
The company additionally points out that "Microsoft Windows Vista Home Basic, Windows Vista Starter Edition, and Windows XP (all editions) do not qualify for upgrades to Windows 7 under this program."
Check out the full details, including a handy FAQ, here: http://event.asus.com/2009/windows7/
Gateway
Check out the full details here: http://www.gateway.com/windows7upgrade/index.php
Dell
"To notify Dell of your interest in the upgrade, you will need to register by providing details on your system and setting up an account. When Windows 7 is available, you will receive an e-mail requesting that you log into your account and place your order. Dell will use your e-mail address to send status updates to keep you informed of your upgrade registration and order. "
Check out the full details here: https://win7.dell.com
HP
There's also a detailed FAQ and buttons for ordering your Windows 7 upgrade disc and checking order status. Unfortunately, when we clicked on the order button, we got the following error message:
"You must use Internet Explorer as your browser to place order. If Internet Explorer is not your default browser, you can find it in your list of installed programs by clicking the Windows Vista START button."
Check out the full details here: http://www.hp.com/country/us/en/mda/windows7/upgrade/index_ww.html
Lenovo
Clicking the Request Upgrade button takes us to a skinned version of the same Mentor Media fulfillment process as Acer and Gateway.
Here's the upgrade page: http://www.lenovo.com/us/en/windows7
Sony
From there, we again end up on a skinned page for the Mentor Media fulfillment process.
The US upgrade page is here: http://esupport.sony.com/US/perl/os7upgrade.pl