The Alienware M11x features an Intel 1.3GHz Core 2 Duo SU7300 processor, up to 8GB RAM, up to 500GB HDD, 1GB NVIDIA GeForce GT 335M, WiFi, 3G, HDMI, VGA, USB 2.0, Firewire, and card reader.
Source: SlashGear
The Alienware M15x features a 2.0GHz Intel Core i7 processor, 1GB NVIDIA GeForce GTX 260m, up to 8GB RAM, 500GB HDD, Blu-Ray, USB, Firewire, and Ethernet.
Source: CrunchGear
The Alienware OptX AW2210 is a 21.5-inch LCD display featuring 1080p resolution, DVI and HDMI ports, 2ms response time, and 80,000:1 dynamic contrast ratio.
Source: SlashGear
The Alienware M17X features dual 1GB NVIDIA GeForce GTX 280M GPUs, Core 2 Extreme quad-core CPU, up to 8GB RAM, 1TB HDD or a 512GB SSD, FireWire, 4x USB, eSATA, ExpressCard, 802.11n WiFi, 8-in-1 media card reader, dual-layer Blu-ray, a 1920 x 1200 pixel edge-to-edge LCD, DisplayPort and HDMI.
Source: Engadget