Perhaps a bit like MobileMe is Sync from Google Mobile. This new application for your phone allows you to synchronise your contacts and calendar entries with your Google account. Operating via a ‘cloud’ this interaction takes place wirelessly, also adding sounds and vibration from your calendar alerts to your phone.
Sync synchronises your data with dual interaction, i.e. any changes made to your phone are applied to your Google account and vice versa. Whilst MobileMe is currently only available for Apple products, Sync can be used on a variety of phones wide enough to cover all the major types of up-to-date handsets, including iPhones, Blackberrys, Windows Mobile and Symbian devices.
This video provides a pretty good overview of its uses in just over a minute: