Just a few ways that cats are useful
Helping at work

(Drechmacher, the museum cat, at Chucalissa, early 80's)
Napping

(Twinkie snuggling in the blanket, 2009)
Keeping an eye on things

(Stormy in the backyard, 2009?)
Decorating the Christmas Tree

(Twinkie, Christmas 2009)
Helping at home

(Pants and John fold laundry, 2009)
Napping

(Pants snoozing on the blanket, 2009)