Sometimes you have created many different blogs and you forget that which Google account you used to create that out, well blogger has a option to recover your email address information and showing you all the blogs linked to your account.
So to access the above service you need to visit http://www.blogger.com/forgot.g and enter blog URL or your email address and blogger will send you all the necessary information right in your email address linked to your blog.
Also check out more : Blogger Tricks and Tweaks
So you will receive email somewhat like below check screenshot.
So now all the blogs linked to your that specific Gmail account will be listed below, so its really any easy trick but can be sometimes really helpful enjoy guys.