At the moment I use E(xact) A(udio) C(opy).
This program almost guarantees that the rips are 100%. No glitches in the wma, mp3, wav or whatever.
It reads the cd's like an audio cdplayer, where more error correction is used.
A drive in a pc/mac doesn't check the data properly. So if there is a scratch on the disk EAC will correct the data like an ordinairy cd-player.
The advantage of EAC is that you don't have to check your ripped tracks/albums. If EAC reads the disks and finds a scratch, it will read the disk/track up to 8 times.
More info:
http://www.exactaudiocopy.de/en/index.php/overview/basic-technology/extraction-technology/
It's freeware.
A Disadvantage: it took some time to configure the program and the needed plug-in (like windows media encoder for wma, or lame for mp3).
But if it works, then it's easy to use.