There has been an age old problem with running roms. Once you decide to switch roms you have to wipe everything. When the new rom boots up you have to go through the arduous process of restoring everything, that is if you remembered to make a backup. Some folks end up picking a rom, flashing it and just sticking with it to keep from having to go through the mild headache of setting up a new rom. There is a solution to this problem thanks to the development work of Paul O'Brien.
The MoDaCo Switch is not a custom rom. The key feature to the Modaco switch is the ability to one set of data between multiple roms. You can even switch between a custom AOSP rom and a manufacturer rom. This is pretty awesome as in the past you would need to do a complete wipe since parts from one rom wouldn't mesh with parts of a new rom. All of your apps and even the settings for your apps will be maintained. You don't even have to boot into custom recovery to flash new roms, the MoDaCo switch does all the work for you. Just select do you want to switch and the Switch will reboot your phone and do the work in about the same amount of time as a regular boot. Check out the Indiegogo page from the source link below for more info.