I think as Tim says repeat saving of JPEG's is the part that degrades the image.
Seeing you have just upgraded to using RAW, I think it is important , and this is the best time, to reconsider your whole workflow, from import to storage, to editing, to output. That is why I strongly recommend you start out with Aperture or Lightroom at the beginning. You will simplify your life immensely.
The point being, that if you use these programs, all your saving and editing stays in RAW (unless you go to another program to edit), so there is no degradation of the image. Then when you decide what you want to do with the image, you choose the format that is most appropriate and will give you the highest possible quality for that purpose - either JPEG for web, or TIFF/PSD etc for printing. There are a lot of excellent books on the process about RAW etc. Save yourself a lot of time and confusion, and mixed up file storage etc - think a whole new and more streamlined workflow.
Just to add a quick point - another important little gem about these programs - is that even when you choose your format of choice for printing or the web etc, the program simply converts these for output each time, and you do not have to actually save a full copy of the image in that format. Saving space.