What is the reason you felt compelled to think about creating the address verifier? If you feel this is an absolute necessity, there is nothing stopping you from creating it but I would like to point you to
ninjastic because it already operates most of the features that you are proposing.
In the spirit of transparency and community safety, I am proposing a Bitcoin Address Verifier tool built specifically for BitcoinTalk Forum users.
Let me explain in detail the workings and how the functionality is to be.