i >> reporter: this time around, helaine olen joined virtually once again stuck at home with the flu. s >> then people began to write to harold and ask him to do an index card. >> reporter: so pollack put 10 items on an index card, took a snapshot and posted it online. it promptly went viral touted on the washington post's wonkblog, on websites boing boing and lifehacker. and thus was born pollack ands olen's short new book: "the index card." a few simple rules... >> and that just seemed much more doable to a lot of people. >> reporter: so, what's on the card? s rule one: "strive to save 10 to 20 percent of your income." which means slashing your spending on what you don't much care about. >> we've got some nice rust over here, also... >> there are other things that i do spend money on. i go on vacations, i go, i take, my wife to bruce springsteen, so, but i try to spend my money on things that i enjoy. and i really just am apathetic about my car, so i shouldn't spend money on it.ab >> reporter: though rule one is easier advised than accomplished, helaine olen acknowledges. >> i mean,