Latex Under and over braces example

I found this example for over and under brakets useful and thought I should keep it just in case I wanted to use it later.
\[
\overbrace{\rho \Big(
\underbrace{\frac{\partial \mathbf{v}}{\partial t}}_{
\begin{smallmatrix}
\text{Unsteady}\\
\text{acceleration}
\end{smallmatrix}} +
\underbrace{\mathbf{v} \cdot \nabla \mathbf{v}}_{
\begin{smallmatrix}
\text{Convective} \\
\text{acceleration}
\end{smallmatrix}}\Big)}^{\text{Inertia}} =
\underbrace{-\nabla p}_{
\begin{smallmatrix}
\text{Pressure} \\
\text{gradient}
\end{smallmatrix}} +
\underbrace{\mu \nabla^2 \mathbf{v}}_{\text{Viscosity}} +
\underbrace{\mathbf{f}}_{
\begin{smallmatrix}
\text{Other} \\
\text{forces}
\end{smallmatrix}}
\]

The example is from: http://www.physicsforums.com/showthread.php?t=264861

More information about how to do this type of writing is at:
http://en.wikibooks.org/wiki/LaTeX/Advanced_Mathematics

Note:
underbrace and overbrace can also be underbracket and overbracket. See that wiki page above if you want more information of how this works.