If you remember to look at all of them, then I say not. Again, if it's working for you... My problem with so many was that I can't remember or be bothered to switch cards that often. As far as @Errands, I break that down into NAs that are ganged mosquito tasks. So, if I write "Buy conditioner" on my capture card, it gets put on my Target shopping list and then Target goes on my @Errands NA card so that I remember to actually go to Target. This is important for me because I am working on saving gas as much as possible and if I go to Target on my way to or from church, it's not out of the way as much as going to the one closer to my house (if that makes any sense at all). It's a tricky business when to put my "Go to $store_name" on the NA list. If it's pressing, I put it on as soon as there is an item on the card. For instance, if the dog is running desperately low on food, dog food goes on the Target card and then Target immediately goes on my @Errands card. If he has more than a week's worth left, then it doesn't go on until my next review. This keeps me from cluttering up a shopping list with things from different places and it keeps me from having to lump in my $store_name cards with my other hPDA cards, thus cluttering up my hPDA. My $store_name cards are cached quasi-offline in a plastic card case that is smaller than my archive one (about an inch thick I would guess). This goes with me in the car or bag and I pull it out when I need it. It also houses some blanks, dividers, and spare DIY Planner hPDA cards for GTD AIO and Projects.