What is it?
I have blogged about SkyDrive before but I'd like to include it in this series for completeness.
So what is it? Think of it as a USB stick on the web. It's 1GB of free storage that you can use however you like - but generally I find it really useful for transferring files between machines, and sharing files with a team.
And if you use the drag + drop facility (requires a small ActiveX control) it's especially quick and easy to use.
You can restrict control over who can access your files, making it simple to share documents and files - or keep them all to yourself.
What's cool about it?
Where do I get it?