Acer's Aspire One 531 has been floating around Europe since April
, but it looks like it's finally made its way to a few retailers over here, and in a couple of different versions no less. Those include the AO531h-1791 "Pro" version, and the AO531h-1440 and AO531h-1766 "Normal" versions, the former of which packs 2GB of RAM and XP Professional, while the latter two dial things back to 1GB of RAM and XP Home. Otherwise, you'll get the same 10.1-inch 1,024 x 600 display on each, along with the usual Atom N270 processor, a 160GB hard drive, and built-in 3G, which can bring the price of the normal version down to just $150 if you also sign up for an AT&T service plan. Plan on spending upwards of $450 if you want to go your own way.