Tagging system in CI

[eluser]danijelb[/eluser]
I am writing CMS for personal use and for learning.

I am completely done just with login
And I am working on articles, pages and image galleries.

They are almost done, but I want to add tagging system to them. So that I can tag each article/page/image and then on front-end show related articles, and tag-cloud.

Is there any tutorial out there on how to this in CI, because I want to move on, build some new things, and I can't if this isn't done.

Thanks in advance.