http://en.wikipedia.org/wiki/DVD_ripper (http://en.wikipedia.org/wiki/DVD_ripper)
Recomendations?
My friend recommends DVD Shrink but apparently it's been taken down (perhaps you can find a mirror). Sadly DVDK9 is a Linux app. Try all the open source ones.
I use DVD Decrypter.
I converted my PS2 games into ISO and vice-versa.
I'm a fan of Handbrake (http://handbrake.fr/).
So, did you find one? I'm considering ripping all my DVDs and trading all but my favourites into Smyths to supplement my tradeins (which includes a faulty Unreal Tournament 3

)
I'm trying HandBrake now...it works well enough but it takes a little over the duration of the actual film to rip. Oh well. Better than nothing.
EDIT: it doesn't work.