NukeEvangelist writes:  

nukeseo.com - a great site with many services for PHPNuke.

nukeSEO includes several advanced tools and services designed to improve the search engine placement of PHP-Nuke sites and to make PHPNuke SEO friendly. This PHP-Nuke addon provides a methodical approach similar to offline commercial tools like WebCEO (for free, of course!) and includes these functions:

Review and validate your robots.txt file
Research keywords, including keyword relevancy, keyword density, "suggest keywords" /
similar keywords function via Wordtracker and Overture, and competitive analysis by keyword
Maintain your meta tags
Generate and submit Google sitemaps (sitemap.xml)
Submit your site to major search engines
Monitor results, including keyword ranking / position (SERP), search engine saturation, link popularity, and (tentatively) Alexa traffic ranking

Travel over to nukeseo.com :: see many screenshots.