Windows: Like other online storage and syncing tools, SkyDrive is great for convenient access to the files you have in its sync folder(s). But it also has a killer feature: The ability to grab a file from a remote computer even if it hasn't been synced or is stored outside of the sync folder.
SkyDrive's Fetch feature is responsible for this awesome capability that can save you in a pinch when you've forgotten a file. 7Tutorials has a step-by-step guide to using SkyDrive's Fetch feature, but basically, you only need a few things: Enable Fetch in the SkyDrive desktop app (if you didn't do so already during the initial set up, it's under the app's settings menu) and make sure the computer you want to connect to is on and connected to the internet. Note that you can only fetch files that are on a Windows machine, but you can use a Mac to upload them to SkyDrive.
Then, log in to SkyDrive on the web from any computer and click on the name of the remote computer. You'll have to enter a security code Microsoft will email or text you for extra security, then you can browse the computer's files, right click the one you want, and upload it to SkyDrive.
For more screenshots and details, you can check out 7Tutorial's instructions or Microsoft's Fetch page.
How to Fetch Files Remotely from Your Computers Using SkyDrive [7Tutorials via TinyHacker]