We've pretty much known about all of these Acer netbooks that are officially being announced today, but their very tempting price tags are definitely new to us. First up is the 11.6-inch Aspire One 721 and 10.1-inch 521, both of which we checked out last month. While the duo are powered by the same AMD Athlon II Neo K125 processors and ATI Radeon HD 4225 graphics, the 721 will start at $429.99 while the 521 at $349.99. And let's not forget that, unlike Intel Atom powered netbooks, they sport HDMI ports and claim to be "HD capable." Speaking of Intel netbooks, Acer's got t
