A friend has a concert dvd and some dvd-audio dvds that he wants to rip the music off and put into itunes. IS there an application that can easily do this? Thanks!

http://www.mactheripper.org/ It is free for a start which beats that other crap program by a mile.

I use this dvd ripper for mac, it works nice and can offer high output quality, you can check it out here for free: http://www.aimersoft.com/dvd-ripper-for-mac.html

That's not free though, that costs money and the trial version is gimped. I use mactheripper too, its just as good as anything you'll pay money for tbh. It might not do everything you want but you can always find another free or opensource (check sourceforge.net) project that does, to go along with mactheripper.

You need DVD Converter. I recommend thisDVD Ripper for Mac. It provides a series of powerful settings to listen to your favorite audio tracks on your audio players. Here is a guide on How to extract audio from DVD on Mac?

You may try this all-in-one DVD Ripper, it can help you extract audio track from DVD movie to MP3 or WMA audio file, my friends recommend it to me, it's easy to use and works pretty well for me, I think it deserves for a try. and here is a step by step guide about how to use it http://www.freedvdripper.net/guides/rip-dvd-copy-dvd-converter-dvd-edit-dvd.html

Try this DVD Ripper for Mac.It is fast in ripping DVD to all popular video and audio formats as it includes the features of DVD Ripper and DVD Audio Ripper. It can rip DVD to video formats like AVI, MPEG, WMV, DivX, RM, MOV, 3GP, 3GP2, MP4, MP4 AVC, etc. as well as rip DVD to audio formats including MP3, WAV, WMA, AAC, AC3, M4A(AAC), OGG, RA, AU, etc.