LGPL may be viral for Java?
The FSF's Executive Director, Brad Kuhn adds "LGPL's S. 6 allows you to make new works that link with the LGPL'ed code, and license them any way you see fit. Only the LGPL'ed code itself must remain Free. Such 'client code' can even be proprietary; it need not be LGPL'ed."
To clarify the Mango position - I licensed it under the LGPL because I want the library to remain free while allowing people to do whatever the hell they want with it. Basically, what I want to maintain is that Mango code stays in the Mango jar file, and isn't bundled into some other jar instead. So go ahead, use the code in whatever application you like, under whatever license you like.