For the past few minutes i am getting 502 Server error when trying to access gmail.com or mail.google.com Any DOS attack?

But i am logged in through google talk and it is working ok.

EDITED: After a hour of this post gmail came back to life. I'm sure they must have worked hard to bring it back. Credits to them, good job guys. It would nice to know what caused the problem.

Google has a application status dashboard and it is available at http://www.google.com/appsstatus#hl=en
Here you can read about the status of most of the popular google applications.

I'm a Gmail user for about 3 years now and pretty much happy with it and its ease of use. My inbox was showing a lot of unread mails and i thought of getting rid of some.

So i need to find out all the unread mails in my account and was searching for a option in the UI to do that. Obviously we'll look for some menu, link or a button to do it and couldn't find any such option. After playing with the interface for a while i figured it out.

Just type label:unread in the search box in the top and click search mail. Gmail happily shows all the unread mails.