Tags… well everybody should be familiar with them.

In the release of WordPress 2.3 tagging was officially introduced into the core WordPress application. Prior to this implementation many of us used plug-ins like Ultimate Tag Warrior, Jerome’s Keywords, Simple Tags and Bunny’s Technorati Tags. Since the release of WordPress 2.3 many if not all of these plug-ins have now been upgraded and work with WordPress 2.3 and later. So if you’re using them and like them you can still use them.

After WordPress 2.3 release tags are now part of WordPress core system. This was confusing for me and many other people because we use with good score other tags plugins.

So maybe this post will help you with this tag thing on new WP versions:
Implementing Tags into your WordPress blog.