The official update feed from the Google Apps team: New Google Calendar features for the iPhoneUntil now the webapp was read only.
... Google Calendar users in the US can now add new events, invite attendees, and see daily and monthly views of their agendas from the iPhone. This release also includes speed improvements for the iPhone interface....
In an essay on the darkness of Apple's App Store policies Gruber mentions a few more calendaring options ..
... Apple doesn’t seem to have any problem allowing Calendar competitors into the App Store. Notes Calendar is a $3 Lotus Notes calendaring client. iExchange Remote Calendar is a $10 calendaring client for Exchange. It can’t even be explained by some sort of anti-Google bias at Apple, because they’ve also accepted SaiSuke, a $10 dedicated Google Calendar client. If these are OK, why not a dedicated Gmail email client? The only explanation is that Mail is deemed untouchable and Calendar is not...Update 11/10/08: The iPhone Google App didn't show me the new calendar. I had to use the URL: http://www.google.com/m/a/faughnanlagace.com (our family domain) to see the new calendar. You can also use: http://calendar.google.com/a/faughnanlagace.com/m. There's still no calendar search -- an odd omission.