The LE, which is really the standard edition for the PS3 version, comes with Dead Space Extraction for free. Aside from the LE, there's also a Collector's Edition which ships with a toy, some DLC, the soundtrack, and an art piece on top of the LE.
The PS3 CE doesn't have the "toy". Only Xbox 360 gets the laser cutter replica. so does the ps3... and you get a voucher for the multiplayer..