I just recently had an issues, while working with a client. An extension I have used for years just wasn't working. This is an extension that downloads an exe file to the clients computer that they use to start sessions. It was embarrassing not to know that this extension (after talking to support) was retired a year ago and just recently stopped working once the developers signature expired.
My biggest question: Why wasn't I notified.
SUGGESTION: Send a general email periodically that could feature an extension and list those that are new and being retired as a way of communicating with your users.
Customer support service by UserEcho