I've been tinkering around with mambo server the last couple of days. In their news article submision form page there is a scrollable list of available images above the text area. You can see around 8 listings of the file names and a scroll bar. To the right is a preview area, so when you select one of the names, a thumbnail is displayed. You can scroll (browse) through the entire list until you find the one you want. Once the desired file is located, clicking a link below the tb image inserts the html into the text area of the form. Of course, this can be modified to UBB code instead, I'm sure. I really like the way it has been implemented into the mamboserver software.
Any idea if that mod you're talking about had a name so I can do a reasonable search, or if that mod is still available and where if it is?
Thanks. I'll throw up a screenshot of the newsform this evening when I get home so you can get a better idea of what I'm talking about.