If you happen to use IntelliJ, I've just released version 0.4 of the Arc plugin:

http://plugins.intellij.net/plugin/?id=2043

Please try it out and let me know what you think. Alternately, you can post bugs, issues or feature requests at:

http://github.com/projectileboy/intelli-arc/issues

Big fat caveat: I'm doing something that blows the heap from within the settings page, requiring you to kill the IntelliJ and MzScheme processes.