For those new to Drupal the term Drupal theming can sound a little scary but really it really isn’t something you should fear!
Drupal theming in its simplest form in just a HTML/CSS layout with a bunch of PHP tags dropped in.

Simply want the ability to remove the default text "Search this site: " from the $search_box variable when theming in Drupal 6, i want to change as well as possibly the submit button's text from "Search" to "Go!" or something like that...

Put this code on template.tpl.php

Customizing the user login, register, and password reset pages is fairly simple, and uses the following concepts:

This is a very simple block to display a link to the login page when the user is not logged in and to display a logout link when the user is logged in. Create a custom block and set the input filter to php.