Google announced you can now sync your data from your mobile phone, such as the iPhone or Windows Mobile to their cloud and have it all managed there. From your contacts, calendars and so on. Here is a video Google published explaining it all.
I will likely give this a try when I get back from SMX West (yes we have live coverage coming up at 9am (PST). But if you want to get started, you can learn more about it at http://m.google.com/sync.
If you need help, there are currently many discussions and help threads taking place at the Google Mobile Help discussion area. Plus there is more documentation at the Google blog post. But if you are stuck, hit up the forums for help.
Forum discussion at Google Mobile Help.
