FPBehaviors is a behavior-based component system for Flashpunk, something anyone really want for their games, but no-one cn afford to do.
Idea is simple, but powerful: don't write same code all the time. In this library developers can found some really useful behaviours, for example like FourWayBehavior: given an Entity (something in flashpunk developer can use to match active/inactive objects in game) this behavior let player to control it using arrows keys.
There are another behavior and tests too, so no excuses, just try it ! (it's open source, of course!)