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 site maps (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 screen shot at http://nukeseo.com

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