Windows only: The Windows Vista for Beginners weblog walks through using the under-used Offline Files feature built into Windows—so you can easily access your network documents while mobile.
The guide steps through how to enable the Offline Files feature, how to make network files available offline, and even how to tweak the amount of space used by the Offline Files feature—well worth a read for anybody storing their work documents on a network share or has the need to access documents from more than one network. The Offline Files feature is really geared at corporate environments, but would work out just fine for users sharing folders on a home network.
Hit the link for the full walk-through, or you can use previously mentioned DropBox for cross-platform file syncing with a web interface available from anywhere—for even more options, check out the five best file syncing tools, use Xmarks to sync your browser bookmarks, or sync any desktop calendar with Google Calendar.
Offline Files - How To Work With Network Files When Offline [Vista for Beginners]