Provide the ability to add tags to issues and then create filters based on the tags

I would like the ability to create a listing of an adhoc set of issues. One thing that I thought could be useful in facilitating this would be the addition of tags to an issue.

Similar to how Amazon lets you tag any products with a label that is meaningful to you, or how flickr.com and http://del.icio.us let you tag photos and bookmarks.

Once I have the ability to tag issues, I should then be able to easily get a listing of all the issues with that tag.

One thing that I would use this functionality for now is to be able to tag issues that were reviewed (or should be reviewed) in a meeting. I'd apply the same tag to all of them and then run my filter and publish the results.