How to Sync an iPhone/iPad/iTouch with iCal Calendar on a Mac

Many people don't realize how easy it is to sync your Calendar and other information to you mobile devices, here are just some of the things you can sync:

Contacts—names, phone numbers, addresses, email addresses, and so on
Calendars—appointments and events
Notes (sync with Mac OS X Mail* or Microsoft Outlook)
Web bookmarks
Music and audiobooks
Photos
Podcasts
Movies and TV shows
Applications
Ringtones (iPhone only)
Books
iTunes U content
Note: On iPad, you can also sync documents via File Sharing with apps that support it.

Here How:
Connect your iPhone/iPad/iTouch to your mac. iTunes should automatically open, if not then open iTunes as well. > On the left pane in iTunes, select your iPhone/iPad/iTouch from the Devices list >
In the main window pane, select the Info tab at the top (your default view is summary) > Scroll Down to Calendars, the second section down. > Check the Sync iCal Calendars box. > You have a choice whether to sync all of your calendars or just selected ones. Just check which that you want. >


MobileMe keeps your mail, contacts, and calendar information in the cloud and uses push technology to keep everything in sync across your iPhone, iPad, Mac, PC, and the web automatically. So no matter where you go or which device you use, all your information is up to date — no docking required.