The day has arrived!  As of today, you can purchase Borderlands on the 360 and PS3!  The PC version will be released for retail on the 26 (next week).  If you haven't bought your copy yet, visit your local video game retailer, or order your copy online from your outlet of choice!  Here are some links to retailers that carry Borderlands:

360 | PS3 | PC Pre-order  

360 | PS3 | PC Pre-order  

Best Buy Borderlands page

Buy Borderlands from Target  

Buy Borderlands from Walmart