WINE is not an Emulator.  It bugs me to reboot into windows when everything else I do and need is in OS X Leopard.VMWare and Parallels work great and are pretty much stable all the time but if all I need is to check some CSS in IE6 it’s a real bother.

If you’re like me you’ll love Crossover for the Mac. It’s amazing. You just install your windows apps right onto your mac. That’s it. No Windows. No Virtual anything. Pretty cool.

CrossOver Mac allows you to install many popular Windows applications and games on your Intel OS X Mac. CrossOver includes an easy to use, single click interface, which makes installing Windows software simple and fast. Once installed, your application integrates seamlessly in OS X. Just click and run your application directly from the OS X Finder. Clicking a Windows file or document — including email attachments — will launch the appropriate Windows program, allowing you to work on the files. Best of all, you do it all easily and affordably, without needing a Microsoft operating system license.

http://www.codeweavers.com/products/cxmac/