The following could be interesting if you are a Data Scientist and want to work on a contest:

Kaggle was rewarded by Mashable as one of five companies to make a global impact.

Kaggle hosts contests for data scientists. Companies that want problems solved post them, along with relevant data sets, on the site. Anyone can submit a solution, and each competitor ranks on a leader-board throughout the competition. So far about 30,000 people have submitted at least one model to a contest.

More information can be found here:

It would be cool to see come participants there working with the Pentaho toolset :-)