After so much of waiting, finally Yahoo introduced a new system that could actually prevent you from the phishing site:
Basically, what this thing do is it labels your Yahoo login site with your own colour and label tab. The step below is how you do it.
First you can choose whether to have a seal text or an image seal tab.
For my login, I chose to have an image and the colour red.
An authentic and legitimate seal for my Yahoo login.
The only problem is it's limited to your browser of choice and it can only use on your own computer. Let me elaborate on that, I use Flock and Firefox both at the same time. The image seal above is created for my Flock browser. My Firefox browser doesn't have the seal. So, this mean it must be configured to each and every browser that you use. Still, it's a good practice to prevent your account from being phished. Yahoo is now using Ajax in it's web application. They are now are almost cool as Google. We'll see a lot of features from Yahoo in the next few months till 2007. Untill then, stay cool..