Google has made a number of significant changes to the way iPhone users can interact with Google and its Web products such as Gmail and Calendar.
Faster Gmail: Gmail is faster thanks to pre-fetching and auto-complete. Type only the first few keys of an email address and Google will automatically fill in the rest. Gmail also automatically reloads all your most recent messages, which means you no longer have to refresh the page.
Custom tabs on Google.com: Go to Google.com on your iPhone, tap "More" on the menu at the top of the screen followed by "Change tabs" and select the three mobile products (Gmail, Calendar, Reader etc.) you use most often.
Enhanced Calendar. Calendar is better optimized for the iPhone so it loads faster and has a month view.
iGoogle personalization: There's a new iPhone-optimized version of iGoogle that enables you to personalize your page with a variety of modules. Click on the iGoogle link from the Google.com home page or go to iGoogle.