Whenever I need to determine if a cell is blank, I call the IsEmpty function on the Value property.
This anonymous blogger uses vbNullString.
In other news: In Firefox, Cntl+Click on a hyperlink and it will open that link in a new tab. Except for the aforementioned blog’s heading. When I Cntl+Click on the blog’s header link, it opens a new tab and it follows the link in the current tab. It seems to work normally for any other link on that site. I’ve never seen that behavior before.