ZipZoomfly.com has the MSI X320-037US Intel Atom 1.6GHz 13.4″ Widescreen Notebook in Black, model no. 9S7-135112-037, for $509.99 (599.99 – 50 MIR) with Free Shipping for a limited time. The $50 mail-in rebate is good until August 31, 2009.

The MSI X320-037US (X-Slim) is the world’s lightest and slimmest 13-inch PC notebook, weigh in at 2.8 pounds and only 6mm at its thinnest point. It features an 13″ 16:9 glare type 1366 x 768 LED backlight display, Intel Atom Z530 1.6GHz CPU (Menlow US15W chipset), 2GB RAM, a 250GB HDD, Intel GMA 500, a 4-cell battery and Windows Vista Home Premium OS. It is also equipped with a 1.3MP web camera, stereo speakers, 802.11n WiFi, Bluetooth, an Ethernet LAN port, three USB ports, a 2-in-1 media card reader, and a VGA output.