When you create a document with iWork ’08 (Numbers, Pages, or Keynote) you can take an extra step to ensure that the document will display with proper formatting in Quick Look by selecting the “Include Preview in Document” check box when you save.
Alternatively you can set this feature to be checked by default in the General Preferences pane.
Do you have a Leopard Quick Tip? Visit the contact page and send it in! Don’t forget to include your website URL if you’d like a return link.