Apple has released an update to Safari for Windows (version 3.0.4).
The browser (still technically in Beta) has improved dramatically in the last two updates.
It IS fast. It gives you an idea of what you website(s) will look like on a MAC (or iPhone).
Or .... you can have a little fun getting your co-workers totally confused on how you got a Mac and they're all using PCs?
The latest version of Apple's Safari for Windows can be downloaded from apple.com here