S.N.
I think it's really important for young children to learn to play by themselves/ entertain themselves. So even though I was in the same room I would let them play w/out me being directly involved (I would be folding laundry, paying bills,etc) for as long as they would.
Other than that I spend a TON of one on one time w/ my children, mostly reading, doing educational toys (shape puzzles, etc) coloring and now playing board games. I still sit and watch their PBS shows with them and talk about what is going on, etc. like I did w/ s. Street when they started watching it when they were 1.