Tips For Creating Great Web Forms (some very good tips, especially those added in the comments section)

http://css-tricks.com/tips-for-creating-great-web-forms/

Great technique for protecting your mailto link (email address) from SPAM BOTs and email harvesting BOTS, involves Apache and PHP4 scripts. aListApart article: http://www.alistapart.com/articles/gracefulemailobfuscation

Building a Bulletproof Contact Form with PHP

by Matthew Pennell (in Articles)

Some of us know PHP inside and out, but many of us still have yet

to take the leap into learning this very useful language.

Virtually all the sites we create need contact forms, and PHP is a

straightforward and safe way to build them. So, for those who are

eager to find reliable PHP code they can copy (and tweak just a

bit), or those who can build a basic contact form but are

concerned about preventing some of the spam-related dangers,

Digital Web Managing Editor Matthew Pennell walks us through the

process, step by step.

http://www.digital-web.com/articles/bulletproof_contact_form_with_php/