Why we don't see all the projects ?
The projects have to be using the latest export code. If they don't export the tag on the hosts, I can't do the comparison for them. The other reason would be that they need to have active hosts. Projects like Rederfarm will probably drop off the comparison soon unless they come back online.
I don't think the server side has any code tags. But checking the checkin_notes file, the option needed to be in this comparison is server side code from code after January 12, 2007. And the code isn't under CVS any more. They recently switched to Subversion.
I have a question as well. You are showing Riesel Sieve as giving 4.3 times the credit of SETI. I happen to run both projects and cannot fathom how you came up with this figure. Based on my own comparisons using 4 different machines and 2 operating systems I only see about 1.4 to 1.5 difference on the average. Care to explain how you came up with your figures?