The application is called Trip1Pogo, and it handles third-party applications.
I'm not sure about Macs but on Windows auto-jailbreak, Trip1Pogo comes installed.
I had a lot of crashes with both Trip1Pogo and SummerBoard installed simultaneously, and I read on several other threads that having both isn't necessary and that if I just have one of them, the crashes are less likely to occur. Since SummerBoard has the same function as Trip1Pogo in addition to allowing customization, the choice is obvious.
The reason why I think uninstalling Trip1Pogo and then reinstalling SummerBoard would fix the problem is because after uninstalling Trip1Pogo and restarting, my iPod froze at the Apple screen on startup. This leads me to believe that Trip1Pogo and SummerBoard probably shared some component, and that by uninstalling Trip1Pogo, I also uninstalled some components of SummerBoard. So without either of these on my iPod, my iPod was unable to start SpringBoard and let me into the interface- thus stuck at the Apple screen.