To just add - skadate support have confirmed that the latest version of IE7 running under vista and SKADATE are not fully compatible .. as detailed above this is mainly to do with subtle differences in css handling between IE7 builds ...
From what I understand from support - SKADATE is optimised for IE7 build 7.0.5730.11
The latest build for IE7 under VISTA that we have running is 7.0.6001.18000
This would explain why the screens do not display the same between XP and VISTA ...
Firefox seems to retain more consistency with SKADATE between XP and VISTA
I think most of us would agree that this is an urgent issue given that most new PC's sold run VISTA and most users run IE7 and hopefully SKADATE will assign this issue high priority - unless of course I have got it completely wrong ....

As a web developer we sometimes have to sacrifice functionality to ensure both cross browser and browser version compatibility to ensure a wider audience. What does anyone else think ... Paul