Released today, this tweak (from @cjori, the developer of other great tweaks like Flowtation, Custom NC Background, and Aloud) give pre-iOS 5.1 devices the same lockscreen camera access that updated devices enjoy. It's free and it works well, placing an always available camera icon on the lockscreen that allows you to slide up to reveal the camera interface--check it out!
One note: if you keep your Slide to Unlock text hidden, this tweak will reintroduce it (see below). I believe the dev is working on an update for that, but that could be a deal breaker for themers.
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