well, we all agree that maven is the authoritative build. But really, eclipse, intellij, netbeans and the big three IDEs, and my guess eclipse eclipses them all In our company we use eclipse and intellij, and they do not step on each others toes.
It's the 80/20 rule, you should support what most developers are using, without making it impossible for the others to interact (.classpath/.project files do not interfere with intellij nor netbeans ).
But anyhow, do you know how to setup a poll? Let's just ask the first question, how many people on the mailing list use eclipse..
but if you don't want to include .classpath/.project/.settings in the svn, then you should add them to the svn:ignore (i'll put up a patch soon)