Two Column Widget

Okay, I’m sure there is something like this out there, but I can’t find it.

My situation is this: I want to have one 400px wide side bar. Into that sidebar I would like the option of having two (200px wide) widget areas side-by-side.

So, let’s say that I can have “Categories” and “Recent Posts” side-by-side, and a 400px wide ad below that, in one column.

Is there a plugin that allows you to achieve this?

Thanks in advance.