You can see the 200 most popular tags on SCN at http://scn.sap.com/tags/. On this page you can sort them by frequency or name, search for tags and filter by content type.
SCN tags are more of a navigation aid allowing users to navigate content by tags and enabling space editors to populate content feeds on their space overview pages with related content. On , for example, you’ll see a “Related Content on SCN” feed for recent content tagged with erp. On the same page, as most space overview pages, there’s a widget with the most popular tags that are the ones you should consider using when creating content.
I wouldn’t count on tagging boosting the SEO value of content. While it is a way for search engines to see relationships between content, like links within the text, you should consult my SEO cheat sheet if you are interested in optimizing content for search:
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