Michel Fortin’s Multi-Safari actually makes it possible to test websites i old versions of Safari, should you feel the need.
Unfortunately, the Multi-Safari version of Safari 2 doesn’t quite work properly in Snow Leopard. For me, it worked for a few minutes. Then, for no apparent reason, it stopped loading web pages — the progress bar would stay stuck at a fairly short length, and the status bar would say it was waiting for the web site.
Is there any way to get it working reliably on Snow Leopard?