WordPress plugin: Contact form 7
It’s easy to use and powerful. You can build a complex form in minutes. However, it took me some time to understand the “Mail” function on the form building page. In fact it is used to define the format and contents of email that sent to the form owner once somebody submits it. The keywords used in the mail template are the same as defined in the above form design. You can also add additional help texts into the email contents to clearly inform you what the exact information is. For example, I built a form with two check boxes, by default only the text of the checked box(es) will be inserted in the email. It’s hard to know their meaning.
BTW, I found the Contact Form 7 conflicts with WP-Task-Management plugin.
update on 25 Nov, 2009:
– Some people asked me about how to add a contact form on a page. It’s really simple: after creating a new contact form at back-end, you get a code snippet for the form. It looks something like “
[...] http://a1hh.com/wordpress/wp-content/plugins/sociable/images/mixx.png 

Wordpress plugin: Contact form 7 – 9rivers.linkka.com 09/04/2009 Sep.04, 2009 in Building websites, IT, [...]
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I don’t know If I said it already but …Hey good stuff…keep up the good work!
I read a lot of blogs on a daily basis and for the most part, people lack substance but, I just wanted to make a quick comment to say I’m glad I found your blog. Thanks,)
A definite great read..Jim Bean