The open-sourced WINE on Linux allows Linux users to run (*some*) Windows programs seamlessly. Some programs work much better than others, but it's always been a Work in Progress. (For example, you can run Photoshop 7 but not Photoshop CS yet). Someone has created a project to bring Wine to OS X. http://darwine.opendarwin.org/ While of course a native OS X app is far better than emulating a Windows app, sometimes there are Windows apps that have no equivolent in OS X. Hopefully DarWINE will help fill this gap. Of course VMWare/VirtualPC will run a lot more apps, but DarWINE is seamless (check out the screen shot) and it's Free. Here's hoping it does well!