Gmail's auto-complete address feature is kind of awesome. I can't remember the last time I actually looked up a contact's email address before sending a message in Gmail. Instead I just start typing their name and Gmail usually locates the address within a few characters.

But there's a downside. Sometimes you'll have more than one contact with the same first name. If you've ever sent a message to the wrong Dave, Jen, or Bob, there's a new Gmail labs feature that can help... sometimes.

The feature is called "Got the wrong Bob?" and it works much like the "Don't forget Bob" feature that was already available in Gmail labs. When the Don't forget feature is enabled, Gmail will pay attention as you start to type a list of email addresses. If that list looks similar to lists of recipients for previous email addresses, it will automatically suggest additional people you may want to include.

Instead of suggesting recipients, Got the wrong Bob will notice if you normally send emails to Paul Simon, Neil Young, and Art Garfunkel and if you accidentally address a new message to Art Vandelay instead of Garfunkel Gmail will ask if you meant to send the message to the other Art.

Of course, there's no way for Gmail to know if you've got the wrong Bob when you're sending a message to a single recipient. But that's why you should really pay more attention to what you're doing in the first place.