Another vote for "Healthy Sleep Habits, Happy Child." My little guy is 5 months old, and he is exclusively breastfed. On the weekends, we are mostly on-demand w/a feeding schedule, but he has a set routine and bedtime every night. We start around 6pm w/a nice warm bath, then we get dressed in our pjs, nurse, sing or storytime, and bedtime by 7pm, 7:15pm at the latest. He's out and sleeps until about 6am the next morning.
During the week, he's at daycare and drinks my expressed milk from bottles for most of the day - 4 ounces every 2.5 hours or so(I go there at noon and nurse) - so Monday - Friday, he nurses at 6am and 8am with a nap shortly after, bottle around 10am, nurse around noon followed by another nap, bottles at 2:30 and 5:00 with a couple of short naps during this time, and I pick him up right before 6pm - we get home and do our usual nightime routine and he's down by 7:15pm. I'm a big believer that routines make your life and your baby's life easier, regardless of whether you feed on demand or on a schedule - when we feed on demand on the weekends, we still have pretty much the same routine. :)