Not to beat a dead horse but I'd say lightscribe is not worth it at this time.
I don't see lightscribe as a mature technology. The media are expensive and the results, while nice, are simple and not really worth the cost (in my mind). I prefer to go the traditional route, purchasing standard DVDs at good prices (I've found them as cheap as $0.16 a piece) and then using a label which I create on my own. Looks better and costs less overall.
That is, of course, my take. Once lightscribe begins to work with color I might consider it, or I will wait for a technology to come along that has the ability to do so.