Digit Mania is a great place to find other digits. The form mail script will let you create forms that email the results to you. The set of hidden inputs at the top specify where the email should go, the subject, and a URL to be shown after the email is sent. Any other input will be put into the text of the email. You can create any number of form fields, and they will also be put in the email.
More documentation is available.
The search script will search all of the .html files on your site. You first must create a search form, an example is the LlamaCom search form. The link color on your background page All of these values must be set in order for the search to work. Make sure you copy that exactly as shown. To setup your guestbook use the control panel .