Useful, though somewhat over-hyped

Kiwi does what it says, and does it well, but it operates on the flawed assumption that the Gmail UI is something sacred that is not to be modified. Gmail is free, powerful, and can meet virtually every user’s needs, but the UI is downright ugly. Beautiful things work better. Simply display labels as tags, enabling clickable tag clouds, and adding some sort functions would bring additional value to Gmail. Tight integration with Google calendar (also “freed from the browser”) is something I’ve been looking for.

TV Weasel about Kiwi for Gmail Lite