[R] R.app "incompatable" with Emacs

[Fredrik Lundgren]

Dear R-users on the Mac,

With Leopard 10.5.2, R.app GUI 1.23, and Emacs 22.1.1 (i386-apple- 
darwin9, Carbon Version 1.6.0)
I've got the following problem. When editing foo.R in R.app I get  
myriads of ^M (end-of-line or CR?) in the file when opened
with Emacs. This isn't trivial to me as I shift between R.app and  
Emacs/ESS.
Any simple tweak?

Fredrik