how about giving them an email address to send their attached zipped files
to?
This way you would have the opportunity to scan for viruses and acceptable
content.
To offer them a way to just upload files to your website would be very risky
and would require you or them to have a ftp (file transfer program).

Wyatt,

You probably need something like a guest book which would require a
Database and likely php. That is, unless you mean something like
allowing visitors to select an image from their computer and send it to
you via your website.

In that case, you use a form (multipart/form-data or urlencoded) and
something like <input type="file" id="file_4" name="Upload" size="32"
value="Select Your file">.

Mike