As of this morning, the tag and find enhancement is live.
Now all archives can been tagged when first created. In addition, the owner of the archive can edit the tags at any time (as well as the description, which has been a much requested feature).
Since we did not require login until recently, all archives have been updated so that Twitter screen name that was provided at the time of creation is used as the owner. If a non-existent Twitter ID was used or the screen name of the user has been changed, those archives will technically have no owner.
If anyone sees any problems or has any questions, please let us know!
(This enhancement aligns with enhancement UI-8 outlined in the post Plans for Updates to Twapper Keeper Functionality and APIs)