Rails - Oct 2005 - newbie configuration question- how to define global config?

Hi,

This is more a general question. How would I define global configuration 
options in Rails? Say I just wanted to define a location (path) where 
member profile pictures are stored.

I''m guessing this should go inside environment.rb. But how would I 
define it, are there special conventions to avoid clashes with other 
configurations? Do I use some registry system?

TIA,

Jeroen