If the current menu using com_content(or com_contentex), this mod will display top rated contents of the category or section selected by the menu. For frontpage and some other cases(the active menu is not using com_content), it will display top rated contents of all categories.It works properly in Joomla 1.5 version natively.
You may interest in collection modules:
mod_latestByCategoryOrSection
http://extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,4554/Itemid,35/ mod_mostReadByCategoryOrSection
http://extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,4591/Itemid,35/
Thanks to John V, This module is his idea!
If you are interest in how it implements, you can see the following articles:
http://www.eboga.org/cms/joomla/oomla-active-menu-section-category-id-joomla15x.html
http://www.eboga.org/cms/joomla/joomla-active-menu-section-category-id-joomla10x.html 
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