I've put a couple of "feedback forms" on my pages, and have been glad to
see how much more input I'm getting. These are just little message boxes
on a page that send off an email. Evidently, people are more responsive to
these than mailto links; just two forms have doubled the response.

So, here's a little generic CGI script that you can use. What it will do
is take their name and message, email it to you, and print out a "thank
you" message that includes a link back to whatever page the form was on
(it does this automatically). It will return some environment information
such as the browser that they are using (useful for debugging problem
reports). Since it's completely generic/automatic you can use it for any
number of pages or an entire site.

Optionally, you can ask for a subject, their email address and home page
url. You may want to have a little "privacy statement" indicating what
data is optional / what data is actually being recorded / if you'll keep
it private or post it publically.

If an email-address or URL is provided, it will do some checks to see if
they are malformed. However, it will not check to see if they correspond
to actual users/sites. 

It will print out all errors encountered (so the user doesn't have to go
back and forth trying to fix one error after another).

The HTML form should look something like this:

<FORM ACTION="http://www.seds.org/~you/dir/feedback.cgi" METHOD=POST>
<LABEL for="NameIn">Your Name: </LABEL>
<INPUT TYPE=TEXT SIZE=25 NAME=NAME ID=NameIn>

<LABEL for="EmailIn">Your Email: </LABEL>
<INPUT TYPE=TEXT SIZE=25 NAME=EMAIL ID=EmailIn>

<INPUT TYPE=HIDDEN NAME=SUBJECT VALUE="This Page!">
<INPUT TYPE=HIDDEN NAME=TO VALUE="your_username@seds.org">

<LABEL for="MessageIn">Message: </LABEL>
<TEXTAREA COLS=72 ROWS=8 NAME=MESSAGE ID=MessageIn WRAP=HARD>
</TEXTAREA>

<INPUT TYPE=SUBMIT VALUE="Send It">
<INPUT TYPE=RESET VALUE="Clear Form">
</FORM>

Notes:

1) LABEL is an HTML 4.0 element. What it does is associate some text with
an input field; hence 'label'ing it. This is so that people accessing the
page non-visually can make sense of the form. I don't know what browsers
support this yet, but you can safely bet there will be some. Additionally,
you can set the style attributes for the label (only IE supports this so
far) and the input fields to provide some nice consistent look.

2) You can use the TITLE="some text" attributes in the LABEL and INPUT,
etc, tags. This is another HTML 4.0 feature that allows you to provide
more meaningful descriptions, e.g. "Enter a URL beginning with http://".
IE renders these as "tool-tips" (win,sun) or "balloon help" (mac).
Netscape does not yet support it.

3) I've shown the subject as hidden, so they can't change it. It could be
an input aas the others are.

4) I didn't include the URL input, it would look like the others if you
want to put it in (NAME=URL).