Glad to help. The Tags view is serviceable, but I do hope that in a future version of DEVONthink that this view is improved, or replaced entirely with a tag cloud that allows the user to narrow the list of available tags based on the selection, even exclude tags from the list by right-clicking on them.
Bill’s suggestion works functionally, but in practice it is just not practical when I want to quickly filter documents by tags. Building compound predicates in a search/smart group is just painful-I feel like I am programming code rather than just trying to find some documents.
A tag cloud addresses both of the challenges listed above. Ammonite does all this pretty well working with DEVONthink databases, but this functionality really needs to be built into DEVONthink.