Yahoo lends a helping hand with Signin Seal
With phishers and vishers growing innovative in designing pages as much impeccably similar to the original the original websites should start helping their users in every possible way. Just observed that Yahoo has a concept called Signon Seal wherein you can setup your signon seal.When you arrive the Yahoo signon widget this would get displayed and you can rest be assured that it is a bonafide signon page. If your signon seal does not appear then most probably you are on a phisher's website.
An example of Yahoo Signon Seal is as below: