cForms is a WordPress plugin that allows you to quickly add forms on your site. The plugin will allow you to collect information from visitors easily. Besides mail notifications, it also provides database back-ended tracking. Pretty convenient if you have to boost the usefulness of your site. Two examples I have more or less been involved is the SEASR 2009 workshop registration form and the iFoundry application form. On both cases, cForms worked like a champ.