Topic tagging for some forums would be an awesome feature to have because of the SEO aspect of it. and a tag cloud sidebar for board index. and topic cloud in the search of the most used tags .This would be cool to have.

I agree and I think although could be wrong but I do think a tagging system is in the works.
I also want it for the ip.content.

I like tagging system becauae it helps the members find wht thay are looking for. Altho its also good because it gets more usefule as more tags get added

Indeed it is great for navigation. I am using it pretty heavy on my anime database, which I want to use the Ip.Content for but right now the IP.content does not have a tagging system.