Take your mind way back to October and you'll recall a Duke Nukem Forever demo offer that meant purchasing Borderlands: Game of the Year Edition would get you access. Besides that, you can now pre-order the game for demo access as well.
A date has been set for the demo release, so if you're waiting patiently with Borderlands or your Duke pre-order in hand (or are still considering purchasing), know it'll be available Friday, June 3.
It's all right here, where Gearbox pokes fun at themselves for the most recent delay:
For participating retailers and such, hit the source.