Tagging system

'sup /prog/

Say I'm starting up an image site of sorts, and want to implement a tagging system. How would I best go about doing that?
It needs to support multiple tags per item, preferably not limited in length, be capable of performing multiple types of searches, be user-editable even after initial placement, I want to be able to display the amount of items that use a certain tag, etc. etc.

I already found this, but I'm not sure if that's the want I want to go.
http://forge.mysql.com/wiki/TagSchema#Recommended_Architecture

Enlighten me /prog/.

That's taking it a step further than I intended on going, but sounds pretty efficient. I'll look into that some more, and you may hear from me again if I bump into something.

Thanks a lot!