it's the type of site that you come to and it either opens a window automatically (bad) or it says "click here for my site" (equally a usability no-no)...but that way you can control the user's browser.
but think about it - you're trying to get people to hire you. while you want to go all out to make a presentation to convice them that you're the best, i think it's generally true that you're going to wow them a lot more if you can do a presentation without changing their user experience. if you have to alter their browser to show them your work, what will they think you have to do to sell them when you do their work?
this is all just personal opinion, of course. if you want to have a popup window with your site after they come to yours (as you can't remove the toolbar from an existing window), you can do so with this type of thing: