Sadly, cleaner xl is terribly out of date and rather slow.
IMO, Procoder from Grass Valley is one of the best alternatives out there. Very fast with high quality output. It's almost as easy to use as Squeeze but gives access to advanced features and settings, not available in Squeeze, should you want to get your hands 'dirty'.
http://www.canopus.com/products/ProCoderSW/index.php
However if all you'll ever compress for is youtube then you might just want to try Riva and Flix Pro
http://rivavx.de/index.php?encoder&L=3
http://www.on2.com/index.php?365
