Minicraft a classic zelda-themed Minecraft clone built by Markus Persson in java
 

As a part of the Ludum Dare contest this month a series of indie game developers have been working for 48 hours on games to submit to the competition

So far I'm aware of the Minicraft submit, and the game plays quite nicely
Play it in your browser with the java applet:
https://s3.amazonaws.com/ld48/ld22/index.html

Source:
https://s3.amazonaws.com/ld48/ld22/minicraft_source.zip

More info:
http://www.ludumdare.com/compo/ludum...review&uid=398