We have our entire downstairs completely baby proofed. I could probably take a three hour nap without him getting into anything dangerous. I sit on the couch and drag the coffee table up against it to keep Leo from trying to attack Charlie while my hands aren't free (which he does with alarming frequency). He just plays with his toys.
It was a lot harder in the beginning when I was nursing 24/7. Now it's only like 10-15 min every 2-3 hrs so, not so bad.
There is an embarrassing amount of television watching going on in our house.
It's temporary, though... until DS gets halfway decent at nursing and I don't have to keep my eyes on him the whole time...
Eventually, we'll go to books or other quiet activities when I can have a hand (or at least an eye) free.