My Apologies matt, I do most of my design in BIDS :)
I downloaded and installed Report Builder 2.0 to try and find the right spot you need. According to the help file to create a "newsletter style report" which is the multiple columns, you right click on the design space (blank space beside the report) click on report properties and there is a Columns node in the dialog.
I just tried it myself and do not see this option.