There's a ton of unused space on the Android lock screen. Sure, there's a nice big clock and notifications appear as needed, but couldn't it be doing something more useful? It can, with FlyScreen.
The FlyScreen app just sits on the lock screen and loads any information that can be brought in via RSS. You can display calendars, news, SMS and whatever other realtime info you want without having to unlock the phone first. The downside is that you're running apps at a time when the phone is normally idle, so battery life will of course suffer.