Simple Dialer Widget
Get fast access to your device's phone functionality with Simple Dialer Widget, an app that literally puts your dialer on your lock screen. The widget lets you dial numbers, browse through missed calls and scroll through contacts without having to take any extra steps.
There are some important security considerations to think through, of course -- if you use a PIN or pattern to protect your device, having a dialer on the lock screen may be counterintuitive -- but it's an interesting option for anyone who uses a plain slide lock.
Simple Dialer Widget is a free download.