If you're lucky enough to be an EU Playstation Plus subscriber, you can get all the Fallout 3 DLC free of charge, with three of them available now, and the final 2 available next week.
Each offer only runs for a week, but once you've downloaded them, they're yours to keep, even if you don't renew your subscription.
Week 1: October 13th - October 19th
- Operation: Anchorage
- Mothership Zeta
- Point Lookout
Week 2: October 20th - October 26th
Between this, the Assassin's Creed beta, and the Killzone 3 beta, PS+ is starting to look like a damn good investment, and worth more than just a few free PSN games a month. Let's hope they keep it up.