Re: Question from a Cat Newbie
Stimulation is really the key to a healthy, happy indoor kitty. Having a playmate will be good, but the humans need to play with them, too. Get some interactive cat toys (most popular are Da Bird, Cat Charmer, krinkleballs, and jingle balls, all should be available at your local pet shop). We play with ours at least twice a day, 15-30 minutes, depending on how long they keep interest.
Also, as mentioned above, kitty-tv (i.e. cat trees in windows). They'll sleep most of the day while you're at work, but its still nice for them to have access to things to watch.
(edited to remove an extra letter that somehow sneaked in)