In Reply To:
When visiting a friend this weekend, I found out however that Mac Internet Explorer 5.1 doesn't play the CSS game nicely.
John, I wouldn't worry too much about that. Microsoft aren't supporting or developing IE on the Mac platform any more and many designers aren't even trying to accommodate the CSS quirks in IE 5 for Mac.
Hopefully this will be a good example of designers refusing to support a poor browser and forcing the users of that browser to change to something more up to date.
No doubt there are still some people stuck on old machines using system 9 etc. but they would be in the tiny minority (us Mac users are a minority as it is
).