After my brief, sarcastic bike corral rant, I think it only fair to share a local example of a well designed bike corral. I like the way it's positioned on the sidewalk.
With lots of room for other bikes.
Each section is placed far enough from the next to allow for two bikes to be set inside without too much difficulty. I also like that it's next to a bench and an informational kiosk. Just seems sort of welcoming. Another identical bike corral sits directly across the street in front of a restaurant, Mountain Oasis (try their Pumpkin Pie Soup for super yumminess!) with outdoor seating. Nice.