I never really went through dotMac preferences and I now wanted to see what has changed with MobileMe. I found the iDisk sync. I googled it and realized that it was there in dotMac. I still think it is pretty cool. What it does is it keeps a backup of what is on your iDisk folder. On top of being a backup, it lets you access your iDisk offline. You can even copy to your iDisk offline and it will be synched back to MobileMe once you have internet access. It can be enabled in the MobileMe preferences.