I always kind of thought "Thankful For Today" meant Hal Finney, being as how he was dying and knew he'd not have many more "todays" left.
Hal being the force behind TfT wouldn't surprise me too much even without this "pointer" to it being him.
Or, maybe not. Who knows.
Just a dumb random speculation ima throwin' out here on the thread today just so's you guyz knowz ima still hangin' around herez ;-)