It's quite easy to visualize several dimensions. You can use the color to represent a dimension, an angle to represent another dimension, the size to represent yet another dimension, the shape of the thing you are showing for yet yet another dimension and x and y for 2 different dimensions more.

So you can easily have 6 dimensions.

I've been thinking about doing a cellphone game and what I thought regarding distribution is to both sell it over a channel (like the Google Android Market) and GPL it. There are several profitable business that work this way (MySQL comes to my mind) and it's an interesting gamble.
IMO, people who buy cellphone games for a dollar are not the people who will download and install GPLed games on their cellphone. Doing that you should maximize the number of people that uses your game without loosing money because of people that downloads the game and installs instead of just buying it. A paypal link (or similar) would also be a nice adition in the game web page.

AFAIK, you can access a DB via both JDBC and Hibernate. Just do most of the job with the frameworks and just the little bit that isn't supported use plain JDBC.