I'm working on a Chrome extension for Gmail. The main feature is Tab completion of templates. If you do a lot of Gmail it might save you a lot of time:
https://chrome.google.com/webstore/detail/quicktext-for-chro...
https://chrome.google.com/webstore/detail/quicktext-for-chro...
What would be awesome would be if the templates could have a bunch of {placeholders} within. So I type the initial prompt and press tab and it autofills the text, then I can tab through the placeholders filling them in.