You can put that clause in your license! Something like: If you use this software in a commercial product, you are required to make an attempt to send me a

You can put that clause in your license! Something like: If you use this software in a commercial product, you are required to make an attempt to send me an e-mail letting me know about it, because it's just nice to know. Of course that would piss off the lawyers because now if a developer uses your software and doesn't e-mail you, you could sue them. But it's not like big companies always respect licenses anyway :)