PlayStation Blog has a post detailing the latest benefits of having a PlayStation Plus membership, and I think you're going to like at least one of them. Most notably, Plus subscribers will be able to download the single-player campaign of Starhawk, in addition to all of the game's add-ons, for free.
While not quite as substantial, Hell Yeah! Wrath of the Dead Rabbit and Tokyo Jungle both have growing followings and both are getting 20% discounts; with PS Plus, they are going to cost $11.99 each. We'll have our review of the former up later this week, if you're taking a wait-and-see approach.