I've been playing a little bit more with tags. The tags should only now appear in text on the homepage (and very discrete they should be too!)
As before, they click through to technorati.
In the main RSS feed the tags are in the metadata, not in the text of the article (where they were previously hidden to humans using a style declaration - not good).
Tags are not on every page, as their main use is helping 'up to the minute' sites like technorati keep 'up to the minute'.
Tags should, however, inform the in-site search box.
The tag manipulation is thanks to the Keywordlist plugin