How to create automatic a list of items used in a LaTeX-document?

hint{foocareful}{Be careful with foo!}{foo is a very precious item and can easily be broken. Be careful, especially don't throw foo.}

begin{enumerate}
   ...
   item Be careful with foo! (pageref{foocareful})
   ...
end{enumerate}

documentclass{article}
usepackage{float}

floatstyle{boxed}
newfloat{hintbox}{H}{hnt}
floatname{hintbox}{Hint}

newcommandhint[2]{%
  begin{hintbox}
    #2
    caption{#1}
  end{hintbox}}

begin{document}
section{Hello}

hint{Be careful with foo!label{foocareful}}{%
  foo is a very precious item and can easily be broken.
  Be careful, especially don't throw foo.}

hint{Don't worry about bar!label{foocareful}}{%
  Unlike foo, bar is pretty easily to get along with.}

section{End}

listof{hintbox}{List of Hints}

end{document}