HP 13.3" Laptop, Dual-Core CPU / 4GB / 320GB for $499.99 shipped after a $50 rebate.  Here is a screenshot for your reference.  It is very portable at 4.2 lbs and features an AMD Neo X2 Dual-Core CPU, 13.3" LCD with a 1366 x 768 resolution, 4GB RAM, 320GB drive, webcam, wireless 802.11b/g/n, and Windows 7 Home Premium 64-bit.  It also has a battery life of up to 6 hours on a single charge.  You might also want to check out this deal.  Most places have it for about $599 or more.