The sharing of environment configuration is very common among high end WoW raid guilds -- we did this on a regular basis and would see significant statistically

The sharing of environment configuration is very common among high end WoW raid guilds -- we did this on a regular basis and would see significant statistically measurable improvements when people setup their interface for specific encounters. The process of going through and explaining each step in your workflow and why it is setup that way helps even with limited collaboration. The drawback to this is environment configuration is very specific to the type of project, size of your team, and the development process you follow. In order for this to succeed as a site you'll need to pick a niche (like any startup should, boiling the ocean is hard) and build an audience around that -- i.e. developers using Netbeans on C++ projects using buildbot for CI in an agile environment. I use this example as you cite Netbeans in your idea and you thus probably know others using it giving you the start of a community.