The guides are adjustable, so you would be able to adjust them to suit any size of ad ( ie.3x2).
But, this actually brings up another point - our new layout. We have just had the newsletter redesigned. The final design was finished on Tuesday evening, but we have not had a chance to reflect the changes on the website.
The new layout will be a big improvement. We've added a new and catchy header to the newsletter, and changed the layout of our content/ad columns. The new ad column opens up the ability to offer your advertisers additional sizes of ads.
I've attached a PDF of the new layout for your review.