Bedtime story time has been a tradition at our house for...I dunno, actually. As long as The Boy's been able to pay attention to the pictures in a book. He doesn't remember a time before story time.
It's one of my favorite parts of the day. The Boy is almost in bed for the night (*whew*), and Isaac gets to step in and spend some time with him, one-on-one, enjoying a story together. Isaac spends time with The Boy, of course, besides story time. And The Boy spends a lot of time with books during the day--I read to him during school, and he reads to himself periodically throughout the day.
But bedtime story time is tradition. I hope we can keep it going for a long time.