I'm switching to Constant Contact from another service that provided the email opt-in box and form. Since it appears that CC does not do this, what do you guys do to let people sign up to be on your mailing list?
Constant Contact does provide this and they have a simple wizard to generate the code for your website. On your Constant Contact web login page just click on the "My Settings" tab and then click the "Site Visitor Signup" link. This walks you through creating your own signup box that you can just copy and paste the code into your HTML page on your website. From this page you can also customize the signup form your site visitor sees to include all of the information you need from them, what lists they can sign up for and also edit the welcome email that they receive. Best of luck!