copy a complete installation of windows to use as a virtual machine on your mac. handy, and i assume, means you don't have to buy another copy of windows 
<object width="400" height="225"> <param name="allowfullscreen" value="true" /> <param name="allowscriptaccess" value="always" /> <param name="movie" value="http://vimeo.com/moogaloop.swf?clip_id=1698937&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1" /> <embed src="http://vimeo.com/moogaloop.swf?clip_id=1698937&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" width="400" height="225"></embed></object><br /><a href="http://vimeo.com/1698937?pg=embed&sec=1698937">Migrate Your Windows PC to your Mac with VMware Fusion</a> from <a href="http://vimeo.com/user698888?pg=embed&sec=1698937">VMware Fusion</a> on <a href="http://vimeo.com?pg=embed&sec=1698937">Vimeo</a>.
i think it's only the new v2 fusion that will do this, but that's free to them wot own v1
<object width="400" height="225"> <param name="allowfullscreen" value="true" /> <param name="allowscriptaccess" value="always" /> <param name="movie" value="http://vimeo.com/moogaloop.swf?clip_id=1698937&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1" /> <embed src="http://vimeo.com/moogaloop.swf?clip_id=1698937&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" width="400" height="225"></embed></object><br /><a href="http://vimeo.com/1698937?pg=embed&sec=1698937">Migrate Your Windows PC to your Mac with VMware Fusion</a> from <a href="http://vimeo.com/user698888?pg=embed&sec=1698937">VMware Fusion</a> on <a href="http://vimeo.com?pg=embed&sec=1698937">Vimeo</a>.
i think it's only the new v2 fusion that will do this, but that's free to them wot own v1
