Why isn't there such a thing?
This evening my neighbor came by to borrow my power drill and despite sitting less than 10 feet away from my front door, I hardly heard her knock and once again reminded myself that I should look into some sort of wireless doorbell, but being a geek I asked myself "Why just go with straight wireless? Why not something more PC accessible?"
I suddenly find myself wondering why (as far as I can Google) there's isn't an inexpensive off the shelf system that I could put at my front door and plug into a PC and notify me when the door bell button is pressed. Why waste time with a stand alone module alone when I could also have a toast pop up?
Yet another time when I wish I had some electronics skills, otherwise this would be a useful and interesting thing to try to DIY.