How do you flag code so that you can come back later and work on it?

#warning This is dirty code...
#error Fix this before everything explodes!

PutTheUpdateCodeHere();

#error finish this

try
{
   //do stuff
   return true;
}
catch // no idea how to prevent an exception here at the moment, this make it work for now...
{
  if (DateTime.Today > new DateTime(2007, 2, 7))
    throw new InvalidOperationException("fix me already!! no catching exceptions like this!");
  return false;
}

// TODO: <explanation>

// FIXME: <explanation>

//TODO: Finish this

class ToDo_helper
{
  public:
     ToDo_helper(const std::string& msg, const char* file, int line)
     {
       std::string header(79, '*');
       Log(LOG_WARNING) << header << 'n'
                        << "  TO DO:n"
                        << "    Task:  " << msg << 'n'
                        << "    File:  " << file << 'n'
                        << "    Line:  " << line << 'n'
                        << header;
     }
};

#define TODO_HELPER_2(X, file, line)
  static Error::ToDo_helper tdh##line(X, file, line)

#define TODO_HELPER_1(X, file, line) TODO_HELPER_2(X, file, line)
#define ToDo(X) TODO_HELPER_1(X, __FILE__, __LINE__)

void some_unfinished_business() {
   ToDo("Take care of unfinished business");
 }

// REVIEW - RP - Is this the best way to achieve x? Could we use algorithm y?

// REFACTOR - should pull this method up and remove near-dupe code in XYZ.cs