Two weeks ahead of the Borderlands 2 launch, the original Borderlands will be hitting PlayStation Plus in North America. Specifically, you can grab it next Tuesday, September 4. If you're in Europe, the game has already been available on there for a couple weeks now.
PlayStation Plus, if you're still somehow unfamiliar, hooks you up with regular downloadable full games and lots more for a subscription fee.
In related news, members next can nab Daytona USA for $3 and Greed Corp for $2.50; this week you can download Space Channel 5 Part 2 and Spelunker HD for $3 and $5, respectively -- discounts on discounts, as it were.