Forgotten Attachment Detector
How it helps do no evil: It happens all the time. You craft an email, explaining what you'd like done or someone to see in an attached file. But, of course, you send it and forget to attach said file.
If you enable the Gmail forgotten attachment detector, a pop-up reminder will come up when you use words like 'attach' or 'attachment', asking if you've forgotten it.
How to set it up: Go to Gmail Labs, click 'enable', and save.
Doing No Good: Unfortunately, this detector doesn't always work. In fact, I only got it to work on two of five attempts using pretty obvious diction in the body of the email. There's a lot of discussion in the Gmail Labs about this feature. It has a lot of potential, but needs work.
How it helps do no evil: We spend too much time in email. With email addict, once an hour your email will shut down, asking you to 'take a break' and you will become invisible on Google Chat for 15 minutes.
How to set it up: Go to Gmail Labs, click 'enable' and save.
Doing no good: If your boss sends you a very important email during that time period, you may not be happy camper. But odds are, your boss has other ways of getting in touch with you, and I find very little wrong with people who decide to enable this add-on. Again, we spend WAY too much time in e-mail.