Microsoft's SkyDrive offers an eye-opening 25GB of free space to everyone — provided you want to use Microsoft's own products to upload to it. The Download Squad blog shows how to open up SkyDrive using an Office 2010 trial copy.
Grab the Office 2010 Beta, ensure that you've got a Windows Live account, and, as Download Squad explains it, you'll only need to create a dummy PowerPoint presentation to get started. Choose Save to Web, select SkyDrive as your means, and then copy the location in the address bar of the Windows file explorer window that pops up. From there on out, it's a matter of mapping a network drive to that SkyDrive location, along with ensuring you've got a Windows 7 online ID provider installed.
Not exactly a two-step process, but it's detailed in full at the Download Squad post. When you're done, you get a 25GB space on your system that's instantly synced the cloud, accessible from the web and can be accessed from multiple (Windows) computers. Neat stuff.