It would be great to just have a little tool like a comment box that could be based on whatever you want... like if you always want to see the max date at a certain point, or the grand total. It would be similar to how you can put formulas in the titles in Tableau like "Current as of <MAX(Date)>" or something like that. The best way (I think) would be to have it like the Annotations, but make it so you can turn it on or off at any stage in the workflow (right now annotations are only show or hide all) and make it dynamic based on results from the workflow up to that point. Right now I'm accomplishing this just by using a summary and browse tool, and then I put the result in the title of the toolbox manually.