This is a quick update to the other post …

1. Open the Settings application on your iPod Touch
2. Open Mail, Contacts, Calendars.
3. Tap Add Account….
4. Select Microsoft Exchange (don’t worry that you are not interested in Microsoft Exchange)
5. In the Email field, enter the name of the account (anything you’d like)
6. Leave the Domain field blank
7. Enter your full Google Account email address as the Username
8. Enter your Google Account password as the Password
9. Tap Next at the top of your screen
10. A new Server field will appear. Enter m.google.com
11. Press Next at the top of your screen again
12. Select the Google services you want to sync. Currently only Contacts and Calendar are supported. Make sure that you have uploaded your data before proceeding
13. Press Sync twice when warned about data loss.

You’ve set up Google Sync for your iPod Touch. Synchronization will begin automatically when you open the Calendar or Contacts app and wait a few seconds to start a sync.

Source: Google Mobile Help