I do a lot of package building and tear-down, and realized this morning that I was tired of manually expanding flat packages and then uncompressing their payloads to figure out what's going on. To that end I created a Finder service in Automator to do all that for me. It takes the selected finder items and then runs them through a shell script that leverages pkguti, gunzip, & cpio to unpack things.
You can find the action on my GitHub. To install, copy the .workflow directory to ~/Library/Services/
