The BBC reports the establishment of "Charity Engine" offering monthly prizes for those signing up.

http://www.bbc.co.uk/news/technology-17995888

We've heard it all before I think but the article makes some valid points.

Quoting David Anderson, lead developer on the Boinc software:
"Polls of computer owners suggest that about 5% of them, when told about volunteer computing, want to participate,"

To reach all those people requires publicity, marketing and other incentives to take part - something WGC would do well to note!

The article also quotes Robin Willner, who oversees IBM's distributed computing project - the World Community Grid

Charity Engine's founder Mark McAndrew:
Often the rewards for volunteering a computer to help with a scientific project were hard to appreciate ... As a result, many people dropped out or never re-installed the software when they upgraded or got a new computer. - True but is offering cash prizes really the way to go?