Polls are what they are--an indication of public sentiment.
Which financial wizard was it that once said "Mr. Market" votes but the true investor weights? Was it a certain Benjamin Graham or a
Warren Buffett? Whoever it was, he had a great point.
Similarly, when it comes to Java DB inclusion in Mustang, we should try to weight the situation rather than simply busying ourselves with casting votes one way or another.
When I first started with my own Java development work about 11 years ago, I always wished to have a developers' database at my fingertips. The inclusion of Java DB in the base Java platform gives that versatility and freedom that I needed as a developer. The wide distribution should now make it possible for people to build cool tools and other gadgets to make it even more fun to use Java DB as a prototyping base if nothing else.
By the way, the argument that Java DB has led to a further bloating of the Java platform does not make any sense to me since Java DB is not even included in the Java Runtime but only in the development kit.
So, weight the benefits for yourself, get going and give it a try and let us and the Apache Derby community know what you really think once you start gaining some experience using Java DB. And remember--Java DB is 100% Java. That says a lot about a database!