I use the scripts at these sites for csv files - they may or may not suit your
needs, depending on your expertise with server-side scripting (they are pretty
simple to set up, but require some knowledge about Unix file permissions - easy
stuff to understand really.
www.ezscripting.co.uk - offers a suite of 'database' scripts - read/search,
write, edit.
There are 'subsidiary' sites that offer other scripts by the same people as
above - a 'news' article script, simple discussion forum, and an emailer script
that can help prevent spam by having the email address in the actual script, not
in a "hidden" input type field (which I believe, spam bots can still pick up.).
Anyway, they all use flat-text files (character separated value files - "CSV".).
Otherwise, have the form handler save the file as an Access database (mdb file),
if your host supports frontpage extensions and asp & access.