I cannot imagine personal computing without a reliable, robust, full-featured sync solution. Over the past year or so, I’ve been using Windows Live Mesh to keep my work files, pictures, Office settings, bookmarks, and other files in sync across multiple devices. Surprisingly this also synced fine with Apple products too.

The need to walk around with USB keys in the pocket which run through the wash, is a thing of the past...

Microsoft LiveMesh is free for up to 5gigs of space...

Here is a little information on the LiveMesh product from Microsoft

Access the stuff on your computers from almost anywhere
With Windows Live Mesh and the Devices website, you can finally stop emailing files to yourself, carrying them around on a USB drive, or worrying whether the version you have with you is the latest.

Sync between computers Keep up-to-date copies of documents, photos, and other files on all of your computers, whether PC or Mac. Even if your computer is offline, you can still view and work on the files you need. Get Windows Live Mesh for Mac (available in English only).	Sync on SkyDrive By syncing folders on the 5 GB of free synced storage space you get with SkyDrive, you can work with up-to-date copies of files on the web from any computer. Go to SkyDrive synced storage
Sync program settings Keep your favorites in Internet Explorer and your Microsoft Office settings up to date on all of your PCs.	Connect remotely Work on your PC from another location, similar to using Remote Desktop Connection in Windows. Run programs and browse all the files on your PC from anywhere. Go to the Devices website to see the PCs you can connect to