This one's a good marketing Strategy for gmail from Google

Emailintervention.com, that's quite new strategy from Google to make its Gmail , even more popular among the masses. The website claiming that Gmail is much more better and superior to other forms of mail and hence should be the obvious choice of people and hence people help their friends switch to gmail by asking them to switch. Here's how

Staging an intervention is simple:

1. Visit emailintervention.com
2. Sign in and automatically identify who from your contacts has yet to make the switch, or just enter a friend’s email address manually
3. Choose from one of three intervention message templates (“straightforward”, “concerned” or “ embarrassed”), and add your own intervention video if you’d like
4. Send a customized email and follow up as needed

Once Again, What a strategy. But what is to be seen is whether people really join this?????
This post on Gmail Blog Save your friends from outdated email—help them switch to Gmail - Official Gmail Blog