SkyDrive from Microsoft gives you 25GB of free online storage. Unlike Google Docs however there are not the same limitations on file types etc and you can only have to access it via the SkyDrive website.

Mike Plate however has just published full details on how to map SkyDrive as a network folder (via WebDAV) under Windows 7 and it works a treat (although it is very slow)

So click here for Mikes step by step instructions.

Now I am guessing that as this uses WebDAV, in theory you should be able to do this under other operating systems but I will let you guys try that one out for yourselves.