The large 15.6" HD screen, the powerful Intel Core 2 Duo CPU and dedicated ATI HD4650 graphics make this a very powerful laptop.
Specs:

• ATI HD4650 graphics with 512MB dedicated video ram
• Speakers on both sides of the keyboard for quality sound output
• Bright glossy 15.6" LCD display @ 1366x768 pixels
• 802.11 draft-n WiFi included
• Combo CD-RW and dual-layer DVD-RW drive
• Headphone and mic jacks in front for easy access
• 4 USB ports
• Gigabit Ethernet port for whenever you aren't near a WiFi access point
• HDMI and 15 pin VGA monitor ports
• 3-in-1 card reader -- MMC, SD, and MemoryStick supported
• ExpressCard 34 slot for extra expansion
• 1.3 Mpixel webcam included
• Your choice of Ubuntu, Kubuntu, or Edubuntu
• 3 hours of battery life
• Dimensions: 14.25" x 10.5" x 1 ~ 1.5" (WxDxH)
• 5.7 pounds

Read a review by Jono Bacon.