Challenge on Yahoo! dataset.

The dataset provided by Yahoo! contains user click logs for news articles displayed in the Featured Tab of the Today Module on Yahoo!
The goal is to optimize the choice of the article to display with respect to a user description in order to gather the maximum number of clicks. Here is the link.

IGARSS Data Fusion Contest

The IGARSS Data Fusion Contest is designed to investigate the potential of multi-modal/multi-temporal fusion of very high spatial resolution imagery. Here is the link.