Model B comes with 512 MB Ram!

www.raspberrypi.org

The Raspberry Pi is a credit-card sized computer board that plugs into a TV and a keyboard. It’s a miniature ARM-based PC which can be used for many of the things that a desktop PC does, like spreadsheets, word-processing and games. It also plays High-Definition video. Available in two versions; Model A and Model B. This is an open-source product designed to be supported by Internet-based user forums. As a starting point refer to the Official website at raspberrypi.org.
Broadcom BCM2835 700MHz ARM1176JZFS processor with FPU and Videocore 4 GPU
GPU provides Open GL ES 2.0, hardware-accelerated OpenVG, and 1080p30 H.264 high-profile decode
GPU is capable of 1Gpixel/s, 1.5Gtexel/s or 24GFLOPs with texture filtering and DMA infrastructure
512MB RAM (Model B), 256MB RAM (Model A)
Boots from SD card, running a version of the Linux operating system
10/100 BaseT Ethernet socket (Model B)
HDMI video socket
2 x USB 2.0 sockets (Model B), 1 x USB 2.0 socket (Model A)
RCA composite video socket
SDHC Class 6 Card
SD card socket
Powered from microUSB socket
3.5mm audio out jack
Header for GPIO and serial buses
Header footprint for JTAG connector
Connector for Raspberry Pi HD video camera (775-7731)
Size: 85.6 x 53.98 x 17mm