Ripping DVD ISOs with a Mac?

Ripping ISOs? As in, creating an ISO image file of an existing DVD disc? Or do you mean mounting an image file of a video DVD and then ripping/decrypting the VOB video streams from it? OR do you mean ripping and decrypting the VOB video streams from an actual disc?

Please clarify, there's a couple different answer to these questions.

Jam it back in, in the dark.

Well now, that's the easiest—no extra programs required. Just use "Disk Utility," which lives in /Applications/Utilities. From there you can select the DVD, and choose File > New > Image from Device... and just create a CD/DVD master (.cdr) image in a location of your choosing. Once it's done you can easily select the newly created image in the sidebar (where it will appear), pop in a blank DVD, and hit that beautiful burn button.

You can, incidentally, also use this program to create compressed .dmg images from folders, password-protected & encrypted images for storage of sensitive data... all of it included with OS X. Gotta love that action.

EDIT: I am, of course, assuming you have OS X of a relatively recent version. If you are stuck on OS 9, then I have significantly less guidance for you (other than find an older version of Toast Titanium and use that).

There's nowhere I can't reach.