@julian I think it happens at bitbangers too. Nothing is hidden other than shoutbox but that is built in.
Popular Tags Widget
Here is another widget, this one displays the popular tags in your forum. You can set how many tags to display in the widgets ACP.
Nice, How about a 3D tag cloud plugin?
(click on Create Sphere 3D)
Both suitable for different niches. Though I love second one, I will be choosing first as it is more suitable in my kind of forum.