But up until now, it's been called Windows Live SkyDrive Beta. I've just received an email telling me that it's been officially released, and the size has been increased to 5GB of free storage!
Anybody can get a SkyDrive, as it's free - just sign up for it using your Windows Live/Passport ID, and you too can have 5GB of file storage online, with file storage areas for private, shared and public files. Gone are the days of moving files between home and work with a USB drive (which inevitably got lost somewhere between the two places).
Imagine - all of your students currently carrying their data around on a USB memory stick (and busily plugging them into USB ports all around your school?), could be using this. What would it cost you to give every one of your students 5GB of Internet-accessible storage on your network?
More info on SkyDrive