When Sony released the PS3 is came with a motion sensitive controller than lacked rumble.  This controller was dubbed the Sixaxis because it offered six axises of motion control.  Sony executives went on to call rumble a "last generation feature" and deny the lack of rumble int heir controller was because of a pending lawsuit over patten infringement.

Well in case you hadn't heard the new Dualshock 3s will be coming to the US this week.  This new controller offers rumble along with motion control (Sony settled the lawsuit).  As a result Sony is phasing out the Sixaxis controllers in stores.  They will be only shipping Dualshcok 3 controllers going forward and gradually new consoles will be bundled with the Dualshock 3.  Currently not all games support the new controller but there is a list of ones that do below:

    Formula One Championship Edition*
    MotorStorm™*
    PAIN
    High Velocity Bowling™
    MLB®08: The Show™
    Uncharted: Drake’s Fortune™
    Resistance: Fall of Man®*
    Ratchet & Clank®Future: Tools of Destruction™
    Go! Sports Ski™*
    Folklore™*
    Heavenly Sword™*
    Warhawk™*
    Super Stardust™ HD*
    Snakeball
    Toy Home
    PSOne Emulation
    Piyotama™
    PixelJunk™Monsters
    Blast Factor™*
    Condemned 2: Bloodshot™
    Lost: Via Domus
    Tom Clancy’s Rainbow Six Vegas 2*
    Burnout Paradise™
    Dynasty Warriors®6
    Devil May Cry 4
    DragonBall Z Burst Limit
    Turok

    *Titles will be given rumble functionality through an update.
    Games that you shouldn't play
    Games better on the 360

Source:
MTV Multiplayerblog - sony-non-shocker-sixaxis-discontinued