This is a poplar app currently available for the iPone and your home Computer. This will be a welcome addition to Android and may be a must have for most Android users.
This is another solution to share your files with your computer and your phone. For free this app wil allow you to share up to 2GB of data and if you need more there is an option to buy more. There will soon be multiple options for Android available for syncing on the go and this may turn out to be one of the most popular solutions. Head over to DropBox for a video demo.