Microsoft call this a newsletter-style report. It only works for me when I export the report to PDF. The report rendered in my browser still has only one column.

Here is a link to msdn which explains how to do it.

http://msdn.microsoft.com/en-us/library/ms159107%28v=sql.100%29.aspx

That URL also has another link at the bottom to a site which you might find useful.