pat/gutentag: A good, simple, solid tagging extension for ActiveRecord.

A good, simple, solid tagging extension for ActiveRecord. This was initially built partly as a proof-of-concept, partly to see how a tagging gem could work when it's not all stuffed within models, and partly just because I wanted a simpler tagging library. It's now a solid little tagging Rails engine. If you want to know more, read this blog post, or have a look at the Examples page in the wiki (which includes a starting point for accepting tag values in a form).