I have added this feature to the ladygrey skin only, to trial it out. You may add tags to any story by using the feature on the top of the screen when reading a story. Related stories will show down the bottom.
On the index page will be the actual Tag Cloud, where you can browse by tag name.
If you have a look and play with this feature, please answer the poll question. If you like this feature, I will add it to all the skins :)
Thanks
I tagged a bunch of my stories. Thanks for adding this feature.