@felgallFeb 13.2007 — #The most common usage of mailto: is to give email addresses to spambots.
For regular browser users its use means that they have to have a separate email program on the same computer and for those browseing the web in libraries, internet cafes etc they do not. There are also a lot of people who have more than one computer and run email on one and their web browser on the other.
For contact forms you can't use mailto anyway since many browsers will ignore the form and just open the email program (if there is one).
The best solution is an email form on the page that links to a server side form2mail script. Add the destination email address after the form is submitted and the spammers would have to fill out the form to send you their spam. Add a decent captcha to the form and they would have to do it manually and would not be able to automate the spamming process.
@nebrivFeb 14.2007 — #I have seen some encrypters that "encrypt" (maybe) the email address so bots can't get them...never use them because i have never had a problem... yet