We're a company focusing on software development, industrial data harvesting (not the social stuff and tracking, it's process and machine control. If boinc would'nt already exist, we'd probably build our own :-) and voice communication servers. What we use a lot is rather bandwidth and storage but processing power. Hence we spend some of our spare CPU capacities here. We have the costs anyways, so why not donate unused resources. No fancy GPUs though, simply straight conventional CPU work on the side.