I could make a yaourt package if it's not on yaourt already. I can't check right now though because I'm at work.
---- Andreas Nilsson wrote ----
Hi! Just before the holidays I did some changes to the project website, and among other things added a Try it Out page with detailed instructions for how to get Cockpit running on different distributions http://cockpit-project.org/running.html
One thing was unresolved was the instructions for how to get it running on Arch Linux. As far as I am aware, Cockpit is available for Arch, but I'm not familiar enough with Arch myself to fill those instructions out.