As you may have checked or read, Front Row has disappeared from Mac OS X Lion to make the final installation lighter and to remove reminiscences of old interfaces in Apple.
The point is that for some people it was useful, and if that is your case I have no choice but to recommend the use of Front Row Enabler for Lion, an app that does exactly what it says.
Easy and simple, how we like things. Does anyone give more?
Link | Mac Hatter