www.mac.com
Basically .mac is a collection of web services that integrate really nicely with OS X and iLife.
You get 1GB of storage and a few neat features:
Example:
-1-click upload of images onto your .mac webpage
-automatic data backup to your .mac account
-automatic sync& backup of contacts, calendars, preferences, bookmarks, passwords etc.
-IMAP mail account
-easy sharing of data on your iDisk with others...
Costs 99$ a year... you can get more storage for less, but you can't beat the integration...