I have been using conditional formatting in my web part pages but have been a bit annoyed at some of it - for example, I want to display a field only when it has some data in it so I set the conditional formatting to hide the field if the field Equals blank. However, it translates this as the field being null which as we know is not the same, as it is only null if the field has been added after the item has been created - if you save an item with an empty field then it still shows. So, I have had to change my conditional formating to show the field if the field is greater than 1, which I assume to be the lowest thing it can be.