Scammers have always bothered the crap out of me. Tax scams are of particular irritation because they prey on people's fear of the IRS or the knowledge of supposed tax "experts." This gives honest tax guys and gals a bad reputation. The link at the bottom of this post is to the latest IRS warning about tax scams.
Remember, the IRS will never e-mail you and ask for your personal information. Generally speaking, your tax preparer won't either, unless you have already established a relationship and the request for information was expected based on an on-going relationship or directly related to tax preparation already in progress. Even in this case, the e-mail should be recognizable to you as coming from your tax preparer and should contain information that makes it obvious that they are sending the e-mail.