I run my phone in silent mode most of the time. Especially if I'm working. I put my phone on my desk within my field of view. I suppose I could have it notify me on vibrate or a sound, but that often gets really annoying when I'm having a SMS conversation with someone.
I don't get a lot of calls. When I do the screen lights up. However, there is no automatic wakeup of the phone when a txt message arrives. Funny as this might sound it took me forever to realize that a green LED light meant I had an SMS, and even then I still don't notice it so easily when I'm working. One of the features I missed about my old phone was that the screen lit up when I had a txt message.
So I built one. Took me all of 15 minutes.
One of my requirements about this app was that it was a "set it and forget it" app. I install it, and it starts working. There is no app to run, nothing to configure. It just works. This is one reason I didn't use SMSPopup. No offense to the developer(s) of that popular app. And I just don't want my SMS to pop up for everyone to see like that.
And when I release an app to the Market, the Market never disappoints. Some people get it and some people don't.
I put in capital letters in the app description "THIS IS NOT A PROGRAM THAT YOU RUN." And I still get comments like "App doesn't launch. Uninstalled" with one star rating.