ok, this might sound like a stupid question- but I have always heard that you should let each muscle group rest for at least a day btw working it again... but I had a middle-school gym teacher that said that the abdominal muscles are the only muscles that are ok to work every day. Do you know if there is truth to either of those statements?
There is truth to both. If you are devoting a full routine (say 40min) to your core, then no don't train them daily. If you are doing a set of crunches every day (which you personally shouldn't be right now of course), then it's fine. It is totally dependent on what your goal is and how you are working them. Keep in mind the abdominal muscles are worked indirectly through other exercises. Working them daily is really unnecessary.
Also remember "abs are made in the kitchen" has a lot of truth. A gorgeous six pack covered in 2 inches of fat is still covered in fat.