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One of the main reasons why XOOPS don't reach the top in particular google is the lack of descriptive META: 'Title', 'description' and to some extend 'keywords' in the templates.
If someone have a good idear to include forum topic 'subjects', article titles from the most common modules, this would properbly give XOOPS users a big boost in google search engine.
ect. the page you are reading now should not have the title 'Official XOOPS Website - Support Forums' but 'Is XOOPS Seo Friendly? - Support Forums - Official XOOPS Website' or just
'Is XOOPS Seo Friendly? - Official XOOPS Website'
by the way thanks for a good CMS. This is no offense to the developers of XOOPS you realy have done a great job and i would still prefer XOOPS before any other CMS that i have found until now, manly because it seems to be much easier to develop modules to XOOPS and XOOPS amazingly seems to work on all the hosts that i have tested it, keep up the good work!
I just personaly see the SEO issue as an very important factor.