Is Aikido really open source? If the wikipedia article is correct, i.e. if some portions of aikido code are covered by the patents (pretty ridiculous I must say, "<< in dynamic languages", oh yeah. Python's "print >> sys.stderr, a" is of course very different idea. Of course the idea of using << in a "Dynamic!" language is some innovative innovation), then the license says I do not have right to copy that code into some other project (unless Sun grants me a license somehow, which I must ask for).
It just sucks if I'm right. Yeah, open source. You may modify it. You may not implement it. You may not reuse its code.