Anyone not worked out how to use #tags in Mind Traffic Control?

All you do is write your tag words with a # as in #work or #food and these items get tagged. Once you have tagged items in your current queue, a select box appears at the right of the "next action" box, allowing you to filter next actions by a tag.

Once you select a filter, only items with the selected tag will be shown. To see all queued items again, simply remove the filter.