Some other enhancements: Gmail loads faster, there's a floating toolbar that includes options like archiving or reporting spam and the interface is more consistent.
"When we make it broadly available, people are going to see this as the first HTML 5 mobile application. It'll be like Gmail in 2004. It was a great watershed moment for Ajax apps," said Google's Vic Gundotra last week. While mobile Gmail is not the first web application that takes advantage of HTML 5 features, it's one of the pioneers.
There's also a new version of Google Calendar that lets you edit events and has an option to cache previously-viewed events. Both updated applications work only for iPhone OS 2.2.1+ and all Android phones.