We put up a baby gate in the doorway going into our kitchen. It's a pretty treacherous area for a little peanut: there's stairs going to the basement and a step down into our little entryway...not to mention all sorts of perils in the kitchen. Needless to say a gate helped with our peace of mind.
Now that Ruby's on the move she frequently camps out next to the gate and gazes into the kitchen. I think she know how much fun she's missing.