Good news: You absolutely CAN resize your reportlets! When you mouse
over them in the editor (i.e., make sure you've clicked "Open Editor"
when viewing the dashboard and have the reportlet options down the left
side), you'll see arrows appear, allowing you to expand the size of the
reportlet up, down, left, or right (depending on where the reportlet
lives on the page). Let me know if this doesn't make sense.