This is a nice extension and works almost exactly like TagJ:
http://extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,1220/Itemid,35/

I would love both of those extensions to advance some more. The explication of this bot say:

"The tags link to the search, so you can find articles with the same tags."

That is not 100% correct as the bot also list articles where the keyword is in the maintext of an article and not in the tags. it would be great if those bots had an option to only do the search in the meta-tags!

So far Phil Taylors Tags solution is the only really working solution for effective tagging.

But if those two bots tagj and DSJtag include only searching the metatags they are just as useful though much simpler. But I would love to use them as they perfectly fit my needs. Moreover the meta-tags of an article can be translated and theses two bots work multilingual. that is not possible to have multilingual tags in phil taylor's tag component so far. So this the bots would be the only solution which is why i am using them on my multilingual site.

So PLEASE integrate to limmit the search on the metatags and they will be perfect!