categories and tags

[eluser]mreeves[/eluser]
I'm building an application that will have a number of different modules. Several of these modules will have the ability to categorize and/or tag entries. Rather than have duplicate code and loads of similar tables i'm looking for a more efficient way of doing this. The best approach I have come up with so far is to to use a 3 table approach as used in wordpress and discussed here Article. And then I guess I would need a taxonomy library and taxonomy model to handle the logic.

Anyone with a bit more experience with CI got any comments on this approach?

Anyone done this before in CI before I reinvent the wheel?

Regards
Martin