Note: Some of these should be moved to the Packaging Team.
Be available on IRC throughout the release cycle for assistance/support and coordination.
Have knowledge of or background in software engineering, and especially with SVN.
Be comfortable working with people. Self-sufficient release managers can end up working in isolation. Social skills are a plus, adequate English is useful, too.
Have a Linux computer so you can use the release scripts, and create the tar.gz files. See: How to release.
It's useful to be able to code in PHP, too, especially to fix any last minute showstoppers.