Nero most definately has a "Normalize" filter, and it's a pretty darned good one, too... will work off a "maximum" volume (in dBFS if I recall) or off RMS.
I use it quite often when putting together CDs for the car or discman... the difference in levels between, say Dead Kennedys "Fresh Fruit for Rotting Vegetables", "Bedtime for Democracy" and "Frankenchrist" is staggering. Of course, they were all remastered at different times by different people. It works really well... I don't feel like I have to ride the faders while I'm in the car.
Bren R.