Hi Daniel,
I just noticed that the original post didn't have spaces after the colons in that section. The config file requires spaces after the colons. Can you double-check that in your database section?
The datasource property should be the way it is in the sample if you're using MySQL:
datasource: Database/Mysql
You can also turn up the debugging output in app/Config/core.php:
Configure::write('debug', 2);
Let us know how it goes.
Mike