I too love Contact Form 7. I wish it had better captcha integration but I just use the 1+1=? question. In any case it sure beats having to hand code forms.

One thing I like to do with this plugin is to use it for "refer website to a friend" button. I configure it so it sends email to the friend and it send me the info on who sent the referral to whom and what they said. This way is the referral calls me I already know some background information based on who shared my site with them.