It sounds like some people are getting concerned about the LGPL now. I’m ranted about my dislike of the GPL before.
According to this post to POI-dev, Dave Turner (Mr License) of the FSF has decreed that the steps required to use an LGPL’d Java library will actually infect client code with substantial GNU-ness via Section 6 of the LGPL. (The “Lesser” GPL is supposed to protect only the Library, without infecting code using the library) This, as you might imagine, puts a few LGPL Java projects that previously thought they were embeddable without being viral in a bit of a bind. Various weblogs have further coverage.