Windows Live SkyDrive, which comes with a hotmail/windows live account gives you 25GB of free online storage. Very handy for storing smaller files as uploading is restricted to 50MB per file.
In addition, with SkyDrive you can download entire folders as Zip files and it also provides an online slide show for your photos. The uploaded files may be kept private or shared with other users.
Looks and works just like an extra hard drive except your files are stored in the 'cloud' :-)
In terms of file storage, SkyDrive seems a better deal than Google. Only 7MB capacity with gmail and a restriction on the file formats that can be uploaded.
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