Now, you can upload and download data from Skydrive without having to open your favorite browser, thanks to SkyDrive Explorer. It’s a tiny standalone Windows shell extension. All you have to do is to install SkyDrive Explorer and start enjoying SkyDrive features as a separate drive in Windows. After you install this program, you’d find a new drive under “Other” category. Double click on it and provide your login credentials. Once you are logged in, just copy paste files from your PC to this new drive, and they get uploaded to SkyDrive. But you can't view files right inside this drive — just copy the files to your local drives and open them.
SkyDrive Explorer works on both 32-bit and 64-bit versions of Windows and runs on Windows 2000, XP, Vista and Windows7. But I didn't have much luck in running it on XP. It worked fine in Windows7. Since it's in beta stage, future releases may address this issue.