coloured_todo_notes.tex

% Stick this in your packages section if it's not already there
\usepackage{color}

% And stick the below before \begin{document}
% If the \FINAL variable exists, suppress \todo{} statements
\ifdefined\FINAL
\newcommand{\todo}[1]{}
\else
% Otherwise, make them red and in bold monospace font, to stand out.
\newcommand{\todo}[1]{\textcolor{red}{\textbf{\texttt{TODO: #1}}}}
\fi