The latest version of Gmail for the iPhone and iPad has an elegant new design -- closer to that of Google Plus -- and several new features. Some of the improvements merely bring it up-to-date with competitors. Others, such as search, should make you think about switching from Apple's Mail.
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Scribble is a new addition to Gmail, although I'm not sure what it's for yet. I've never wanted to draw on my iPad before, and it was really hard to draw anything sensible on my iPhone. It might be useful for simple electronic signatures, but there are more professional ways to add electronic signatures.