Dual booting on Android is a lot of fun. Not only does this give users a chance to run multiple ROMs, but users can also separately customize each instance of the OS to suit their needs. Sony Xperia S owners may be getting dual boot functionality very soon.
XDA Senior Member letama has released a very rough Boot Manager for the Xperia S. We say rough because it’s version 0.2, and it has been deemed okay if you don’t mind the experimental warning label. There’s a lot of work going on with this project, so it shouldn’t take an excessive amount of time to compete.