Living on del.icio.us this morning. Some more finds:
Phorm: PHP form processing
Can include form data in an acknowledgement page, email it to one or more addresses, validate it, includ it in an autoresponder message, lot it to a text file or mySQL database.
Also available is a "jr." version:
Phorm Jr is as stated on the site: … smaller and simpler, making it easier to install and configure. If all you need is to acknowledge your visitors and email the form data to yourself, then Phorm Jr. is perfect for you.