HP’s ProBook 4310s, a 13.3-inch laptop for business users, is now available for purchase. Starting at 4.3 pounds, the new ProBook features the Intel Core 2 Duo processor, up to 8GB of DDR3 memory, the Intel GMA 4500MHD integrated or the ATI Mobility Radeon HD 4330 dedicated graphics chip, up to 500GB of hard drive space, [...]