"Editor www.nutritionsoftware.org" nseditor2002
wrote:

I have the Digital Rebel and been using the default parameter for color
space. Since I use Photoshop to edit my picts, should I set both color
spaces to Adobe RGB? Is there an intrinsic advantage to using Adobe RGB
which as I understand is a larger gamut than sRGB.

The gamut is larger, but not by a huge margin:

http://www.brucelindbloom.com

Clink "Info", then on "Information about RGB Working Sets".

Whether you should use the Adobe space or sRGB depends. For example,
if all your images are going to be viewed on sRGB monitors, then at
some point all that "extra information" will have to be "removed".
Would you like the camera to do this at image collection time (at zero
time cost to you), or would you like to do it post-exposure in
PhotoSlop?