One-upping itself once again, SSBB is going to let you share those custom maps, and your friends won't be the only ones seeing your work (though that is an option). You can also send your maps to Nintendo, who will then select one map daily to send out to all players. That's right: You'll not only have a chance at map stardom, you'll be receiving a daily infusion of new content.
Be honest with us: Would a valentine to Nintendo be too creepy?
[Thanks everyone who sent this in.]