File Juicer

File Juicer til Mac OS X

Search & Extract

Images

jpg jpeg 2000 gif png pdf wmf emf tiff eps pict bmp

Video

mov mpeg avi wmv

Sound

mp3 wav System 7 au aiff

Text

ascii rtf html

From:

avi cab cache chm dmg doc emlx exe ithmb m4p mht mp3 pdf pps ppt raw swf wps xls zip and other formats

NRG - Nero Disk Image

File Juicer may recover some of the individual files (images typically) from Nero disk images.
You should also try nrg2Iso which will let you convert a NRG disk image to an ISO disk image.