A download for Windows SharePoint Services 3.0 is available on Microsoft's Download center that incorporates Service Pack 2, but not Service Pack 3, which you will need to install separately. See link items in section below for Chapter 1.
Point 4. Should read "Double-click NewTask.aspx to open it in the document window".
In the Tip section, last sentence, replace reference to script with style, so it should read:
Point 6. Last sentence, should read 'Therefore, the styles in the ApplyStyle.css file are applied first, followed by those styles in the <style> tags on the current page, followed by inline styles.
First sentence on the page, replace <script> with <style>.