I did!
At first I thought it was only with the GOTY edition but on steam forums:
If you purchased the Borderlands base game prior to Oct 12, 2010 you will receive a code in your account for the Duke Nukem “First Access Club”.
To view this key, right-click on Borderlands in your Library and select "View game CD Key".
Go to
www.dukenukem.com/access" onclick="window.open(this.href);return false; to input your code...
Enjoy!
So I'm getting it when I get home!