It works perfectly now: but it will stop working altogether at the end of June.
Assuming you have Lion 10.7.2 (please always post your system when you have a query) you can migrate ad http://me.com/move. When you sign in in System Preferences>iCloud and enable the various kinds of data you want synced your email, calendars and contacts will be synced just as before. However your iDisk, together with any website hosting, and the Gallery, will stop working at the end of June so you will need to find a third-party alternative. This page examines some options"
If you are running an earlier system your options are more limited - if this is the case please ask.