What are the Conventional GEM PATHS for Ruby under OS X 10.5?
As Gabe mentioned, yes, this is normal.
A little more info:
/System/Library/Frameworks/Ruby.framework <-- used system wide for all users, usually owned by root.When you 'sudo gem install ...' the gem you're installing goes here...
/Users/matt/.gem <-- user 'matt' has his own gem directory. every user gets one.
When you just 'gem install' as 'matt' it will fall-back to your private gem dir. This gets created automatically the first time it's needed.