With iPhone 3, whenever I opened the phone enough to see the message counts for my calls and messages, it would clear the notification automatically so the alerts wouldn't keep appearing. I already knew who was calling from the alerts.
With Android, I have to open the calls or messages apps specifically to clear the alerts. I find this annoying. That notification light can be blinking all night long until I have the energy to open up the apps rather than just checking the phone.
It's like somebody actually tried it first, before releasing the software. I consider that that the first step toward decent design, but often and strangely a step that never seems to have been taken.