Removing all of an Application?

I am having an issue with the AppStore, and this is a related, but different question.

How do I find and remove all bits of the AppStore application? Besides the obvious app itself, sitting in the application folder, what prefs, helpers, etc are there that must be removed?

I ask this because when I removed the application file, deleted it, and reinstalled (from 10.6.6 updater image), the app icon showed a pending update the moment it launched, and it showed that I was signed in to my account. This implies there's more stuff I need to delete.