Widgetlocker - probably the best phone-customization app for android, it allows a fully configurable lock screen. I have mine with the music widget, the same clock/weather hdwidget that's on my homescreen, and two ICS-style unlock circles that link to four apps a piece. From my lockscreen, the two unlock circles give me direct access to my camera, maps, grocery list, text messages, weather, flashlight, voice search, and of course standard unlock and ringer toggle.
It's a couple of bucks but totally worth it
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