Weekend Discussion: Why Should I Buy a Tablet PC?

I’m John Doe in XYZ office and I’m looking for a new notebook computer for me and, potentially my staff. Talk to me about why I should even consider buying a Tablet PC. Where am I going to see the benefits? What can it help me or my office staff do more productively than what I’m currently doing with a traditional notebook or desktop? Is the pen a new fangled toy or is it really beneficial? What software would you recommend I look at and why?