I have an HTC Desire and a Mac (10.6, if that matters) and I sync them via Google Contacts.
Many of my contacts in Apple's Address Book.app have a birthday set, but it does not transfer to Google Contacts and thus not to my Android Contacts.
If I create a new contact on Google Mail/Contacts and set a birthday, it is immediately synced to my Android phone, complete with birthday, but in Address Book.app the birthday is missing.
How can I get my birthdays in sync?
If a proper sync is not possible, it would be nice to have at least a calendar that is synced, but I don't know how to add the calendar that Address Book.app can generate automatically to my Google account to sync.
I have seen icalbirthdays but I don't think it can help me. I would like to avoid kludges like creating a calender from Address Book in iCal, publishing that to a third server and subscribing in Google Calendar...)