According to this CNN report and this ZDNet blog post, Polaroid’s instant film will no longer be produced by the end of 2008. The following is from the notification of Polaroid instant film availability page at Polaroid.
Due to marketplace conditions, Polaroid has discontinued almost all of its instant analog hardware products. Polaroid has also made the difficult decision to cease manufacturing of instant film products in 2008
If you are interested, Polanoid.NET has a large collection of Polaroid pictures.
Keywords: Instant Film, Polaroid, Polaroid Camera, Polaroid Film