I had to send five "what browser are you using" e-mails just last Friday. And people never send the OS when we ask. Thank you, thank you for making this.
One thing that has become standard practice for me is to have any "contact us" forms or error reporting pages automatically include all of this information when sending messages. I also generally record persist the browser information on important "events" such as registration and login, so I can refer to it if I need it later.
You don't need it most of the time, but it saves so much time to not have to bother asking for it.
You don't need it most of the time, but it saves so much time to not have to bother asking for it.