Plug this date in your calendars: May 17th. This is when 4,400 Blockbuster stores will be renting UMDs for Sony's PSP. The first run of rentals will include "Twisted Metal: Head-On(TM)," "Untold Legends: Brotherhood of the Blade," and EA's "Need for Speed(TM) Underground Rivals." Games will be available for the $6.99 rental fee, which gives you 7 days of non-stop play. So get ready for some thumb-numbing enjoyment on your PSP. [Via]