Audio Leveling Software Recommendation?

Hi all, I'm new to the forum and tried searching the archives with no luck. I am using a Squeezebox 3/PC based music server, ripping lots of CDs and LPs that I am converting to digital.

Are there any recommendations you have for audio leveling software? You know the problem - different tracks/albums are all mastered differently, some quite hot and I'd like to avoid having to adjust the volume on the preamp (up or down) from one track to the next. I'm not averse to paying for some sw either if it solves the problem.

Thanks in advance!
John