Add this to the list of Tax Day surprises: the Dell XPS 18 all-in-one is available for pre-order online one day ahead of schedule. The giant tablet / semi-portable desktop won't actually ship until the first week in May, but you can add one of three configurations to your cart now. The entry-level model, with a Pentium processor and a 320GB hard drive, will set you back $900, while Core i3 and Core i5 versions are priced at $1,000 and $1,350, respectively. We liked what we saw when we went hands-on with the 4.85-pound PC: its flip-out feet let you transition between slate and desktop mode easily, and the 1080 capacitive touch display is very crisp. Admittedly, there is only a handful of tabletop Windows 8 slates, but the XPS 18 can hold its own against the Sony VAIO Tap 20 and Lenovo's jumbo-sized Horizon Table PC. Click through to Dell's US site for more details.