Thunderbird users who have installed the Lightening extension and are using that calendar can't directly sync with a BlackBerry. But, by linking both your computer and your handheld to a Google calendar, you can achieve synchronization. Events inputted on either device will be pushed to both at frequent intervals.
Device Index calendar
MobileMe keeps email, contacts, appointments up-to-date between a Mac, and iPhone, iPod touch, and even a PC. That means if you make a change to an appointment or an address on your home computer, it will automatically appear on your iPhone and on any other computer you've set up.