I frequent Apartment Therapy and especially love the house tours. I saw this idea recently in a Chicago house tour for storing notecards:
Here's the other view of the living room so you can get a sense of where the notecard bowl is placed:
Now I don't know how well this would go over with a little one crawling around, but I'm sure I could reposition the bowl when baby gets mobile. The renter of the apartment, Emily, mentioned in the comments of the house tour that she saw this idea somewhere and stole it herself so I want to steal it too! She mentioned it's a great way to keep your notes out and accessible to cherish the memories and well-wishes friends have sent. I really like that!
You can check out the full apartment tour here as well as Emily's blog.