Eternal Man [EE] and Zephni have collaborated together to create a fantastic and easy-to-use scrolling engine, for use in platformers primarily, but can be adapted for pretty much any game genre. It's open source, very brilliant and extremely helpful so there is no excuse to not download it.
Comments from the Author:
"It features a smooth follow-cam, "looking around", scroll-borders and the infamous Metroid-style doors... The whole thing is 60 events, though it's quite improvable and compressable since the events are ordered in such a manner that each feature is easily recognized and removed from the rest. If you intertwine the features you can save a hugh amount of events. "
Click here to view the engine and its comments