I think it's about time for POW to "grow up" and become more than what it currently it by going open source. For version 5, I have been working towards this goal. While I've wanted to go open source for awhile now, the way POW is structured is unsuitable for public involvement, due to how messy and amateur it is. It is the byproduct of a learning experience.
As I've been working on that new game I mentioned a few posts ago, I've learned the joys of programming in a more proper method, and now, coming back to work on POW, it's irritating. So, ever since releasing 4.4.11, I've been working on rewriting POW into hierarchical, encapsulated/modular code structure (which, btw, might have the side-effect of correcting a few troublesome bugs that are a consequence of the way things currently work).
Once I'm done with that, I plan on starting up a github to host POW's source files. Those with programming expertise could contribute to the programming side of things (AS3, similar to javascript), and those with the tools to create flash vector animations could download the .fla and see what they can do in there. Contributions to the official release would need to go through the usual QA and approval process by me, although there would be nothing stopping people from making their own unofficial variants of the game.
The coding process could take awhile, and I wouldn't expect any art news for the next month. And I'd be curious to know if anyone here would be seriously interested in getting involved with the open source version of POW once it's ready. Leave a comment ;)