Start menu subfolders
Everyone knows this already, right?
To put start menu items into a subfolder, use folder name and backslash.
I use it to try and help keep the start menu tidy, since the most commonly used shortcuts end up on my desktop and/or quick start menu. If I can tidy away Firefox, Thunderbird, Filezilla, Kompozer and whatever else that’s Net related into an Internet folder, my Start Menu might not grow to take over the whole screen when I open it.
You can also move them around after installation, but that means if you ever remove the application, it won’t know where to find the shortcuts and remove them. (You’d hope one day they’d get this fixed in Windows.)