I wrote yesterday how I purchased three modules at Snowcovered.com to save a ton of hours in getting the company's new website online. I will discuss those after the site's online, as they were the bread-n-butter of the site's content delivery UI. But the Webstone Shadow Module is more valuable than those three modules put together, and its free.
What the Webstone Shadow Module does is allow you to alias (uh, shadow), say, a Link List from another page. DotNetNuke has a module setting of “Display on all tabs?” Yes or no? That's helpful, but you usually want to duplicate a webp.., module (I keep wanting to call them webparts), on 3 or 4 pages only.
There's also an Inventua shadow module which I recently discovered. I may give it a try, since I had trouble shadowing a particular module today for the first time...