Group Tiles is an app like many to help you organize your Start screen.
It allows one to create separator tiles with headings, lines and icons, as can be seen in the screen shots above.
The app is free for the first 3 headings, but after this will cost $0.99.
WindowsPhonino however has 100 codes to give away which will increase the free limit to 6, which is probably enough for everyone, and will later give away 10 codes for unlimited headings.
If you are interested find the codes at WindowsPhonino here.
Group Tiles can be downloaded from the Windows Phone Store here.