can i sync my macbooks iCal with a mytouch 4G?

you can sync your mac calendar (iCal) with gmail calendar (you must have a gmail mail account). in iCal, click on 'iCal', 'Preferences', Account Info tab, then you add a CalDAV account syncing with your gmail email.
all entries you make on your iCal that are entered in the same color as your gmail CalDAV account, will sync to gmail's calendar.
Unfortunately, there is no way to sync your address book to Gmail. You'll have to export your Apple Address Book contacts to a vCard backup, then import them into your gmail account. It's a little tricky but it works. Unfortunately, you then have to export every individual update/new contact from your Apple Address book, and then import it into your gmail contacts.

 

I just got the Mytouch. Address book is super simple. In Address Book preferences, under Account Information, there's an option to sync with Google. Easily done. Problem with ical is that you can only sync the Google Calendar to iCal... you can't sync already existing iCal calendars to Google.. as far as I can tell. So if anybody has a solution to that, I'd love to know. Thanks!

 

If you want to go direct without using Google, get the app SyncMate, and the application for your mac ($35) you can do your address book, calendar, itunes, bookmarks and more.