With sh404SEF you can:

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Improve your search engine ranking and get more traffic to your site
o get the shortest, most significant urls for your site and your web rankings
o generate 'human ear friendly' URLs
o create unlimited short URLs for any page
o remove duplicate URLs
o customize the page title and page description
o automatically emphasize all your article titles with "Heading tags"
o satisify many of the Google recommendations for search engine optimization with just a few clicks
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Protect your site from common exploits including:
o cross-site scripting attacks (XSS)
o malicious page requests
o flooding attacks
o robots spamming input forms such as the contact page (using Project Honey Pot)
o site access from suspicious domains (using IP address white listing and black listing)
o identification of site software using the 'meta generator' tag
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Improve site navigation and HTML best-practices
o turn error pages into articles containing popular links and/or other relevant content
o automatically indicate the links on your site that lead to external sites with a small icon
o automatically convert table-based ouput of core Joomla extensions to the preferred tableless HTML