Since Sony revamped Playstation Plus during this years E3, several supporters have noticed a drop in quality. This is due to an increase of PSN titles and a decrease of disc titles. However this is about to change, as Borderlands will be free with plus on September 4th. Additionally all of the DLC will be half off with plus too, which should give you plenty to do before Borderlands 2 releases on the 18th.
While this is certainly exciting news for plus members, it still isn’t as exciting as Spelunker HD going on sale. However you should have plenty of time to platinum Spelunker HD (only $5 dollars!) and then start your adventures in Pandora with Borderlands the next week.