I like your article and there are lot of tips in it I can use. Beside of Shadow, I also use DateBk5 for linking items to todoDB. This gives a better view what I have todo. I see the advantages of tags, only I don't have a good idea to use them right. Filtering on tags, lets also see the projects. This makes that you can't see directly which items you have to do and what exactly you have to do with that item.