The trick is to add the inputs to a (persistent) data structure -- in this case, a List of Lists.

# first, we get the parameters from the form with $q, a CGI.pm object
my $name = $q->param('name');
my $color = $q->param('date');

# next, we add an anonymous array of these values to our array of all 
+users so far
# remember the order:  element 0 is name, element 1 is date
push @all, [ $name, $date ];

# Not Included:
# display that user's answers
# start a form with a drop list asking which to sort by

# in the next section of code, do something like this:
# grab the parameter from the drop list
my $sort_field = $q->param('sort_field');

# three-part comparison.  Is the sort field 'name'?
my $sort_sub = $sort_field eq 'name' ? 

# if yes, sort by the first field in the array of arrays
    sub { $a->[0] <=> $b->[0] } :

# if no, sort by the second
    sub { $a->[1] <=> $b->[1] };

# remember, sort() can take a subroutine reference to change its behav
+ior
@all = sort $sort_sub @all;

# Not Included:  
# display @all in the browser
[download]

Not a big thing. :)