GooSync synchronises iPhone & Google Calendar
We’re yet to see full Exchange support for the iPhone - remember, that means calendar and contacts synchronisation as well as push-email - but if your schedule is managed by Google’s online Calendar service then you’re finally in luck. GooSync, whose eponymous product keeps your cellphone and calendar wirelessly synchronised, have seemingly released their iPhone client early (it’s down as being expected Q1 2008), meaning you can now keep appointments and address book updated across both.
GooSync comes in free and paid versions, the latter priced at £19.95 ($41) for twelve months, differentiated by how far ahead appointments are transferred to your iPhone (30 days in the free version, a year with the paid version), whether contacts can be synchronised (bidirectional sync only on the premium version) and the ability to connect your iPhone to multiple calendars.
If you already use Google Calendar then this could be ideal, particularly the ability to update while on the move.