For those of us looking for an iDisk alternative, Zester has come out with the ZumoDrive. The ZumoDrive is a free service (up to 2GB, you can purchase more) that allows you to store and sync files to the cloud just like Apple's iDisk. The app has three main sections: Files, Music and Photos.
This is how it works: You install the Zumo client on your PC or Mac. Once installed it can automatically look for your music and photo libraries. You can also add your own files and folders to sync too.
Once your data has synced to the cloud, it is accessible on your iPhone over EDGE, 3G or Wi-Fi. One nice feature I particularly like is when playing music, it displays the album art of your song; this is really a nice touch. Your data is also accessible via a web browser too when the iPhone isn't enough. To learn more about ZumoDrive, click here. [Free- iTunes link]