What I am considering here is a whishlist site for application or machine upgrades.

Like this:
You are using an application, or machine, which is missing a feature.  You can of course write to the makers of the application but that feels like your voice isn’t heard.  Why not instead start a thread on a site known for serving users and manufacturers with good I-want-this-application-to-do-that information.

It already exists at getsatisfaction.com but that site concentrates on selling to the application developer and is not user centred.  It is up to the manufacturer to start a forum and pay for it.  I am looking for something faster and simpler.  A natural place for users to write and manufacturers to read.