Perhaps tagging/social bookmarking is the key to the context, though?
Tagging is an interesting phenomenom - as this survey by Pew indicates. And I would split taggers into two groups:
- Creators / Uploaders tagging their own content (blog posts, wiki pages, photos, videos, soundfiles, etc).
- Users tagging other people's content.
I suspect that the first kind of tagging is relatively common - esp. with photos. Photos are non-textual (unlike blog posts) and yet do not have a standard set of metadata lying around for them (such as the artist, title, album set for songs) so if you want to retrieve them then some form of tag is bloody handy (for both you & your users).
Why people tag the content of others is a little different. I may want to find something again (but if it's a file, I'd probably download it). But I might also want to share it with others. The "social" bit in social bookmarking is critical. These systems work when groups of people want to share things with each other. And yet sites like YouTube have "share this with a friend" buttons that obviates the need for that. So the tedious business of tagging is often unnecessary. If the purposeful social connections aren't there between people, I can't see it working on a large scale inside the enterprise.
Going back to Simon's comment, I think you need a common social context before you can engage in collaborative tagging activities.
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