nukeevangelist writes:  

nukeseo.com :: nukeSEO brings the power of several advanced tools and services designed to improve the search engine placement of PHP-Nuke sites and to make PHPNuke SEO friendly

- 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

see the nukseSEO administration screenshot at nukeseo.com

btw: Other professional PHP-Nuke enhancements, addons and tweaks are in the works - including job posting, calendars, location mapping and more. Stay tuned for further details