Here’s what’s available for use, starting now:

SkyDrive for the Windows desktop (preview available now). View and manage your personal SkyDrive directly from Windows Explorer on Windows 8, Windows 7, and Windows Vista with this new preview app available in 106 languages worldwide.

Fetching files through SkyDrive.com. Easily access, browse, and stream files from a remote PC running the preview app to just about anywhere by simply fetching them via SkyDrive.com.

SkyDrive storage updates. A new, more flexible approach to personal cloud storage that allows power users to get additional paid storage as their needs grow.

SkyDrive for other devices. We’ve updated the SkyDrive apps on Windows Phone and iOS devices, bringing better management features and sharing options to those devices. We’re also releasing a new preview client for Mac OS X Lion, letting you manage your SkyDrive right from the Finder.

via blogs.msdn.com

Microsoft does disservice in not marketing SkyDrive effectively. It is an Awesome service few people know about. Definitely a competition to Dropbox and other cloud storage services. 7 GB free for new users (existing users can keep 25 GB free) makes it very competitive and now integration with Windows Explorer on Win7/8/Vista desktop, Windows Phone/iOS devices and MAC OS X Lion makes it even more useful.