>>
>
> perhaps the gem was installed in the wrong place somehow?
>
> razor:~ dhaskew$ sudo gem env gempath
> /opt/local/lib/ruby/gems/1.8
> razor:~ dhaskew$ cd /opt/local/lib/ruby/gems/
> razor:/opt/local/lib/ruby/gems dhaskew$ ls
> 1.8             cache           gems            specifications
> razor:/opt/local/lib/ruby/gems dhaskew$ find . -name "*sources*"
> ./cache/sources-0.0.1.gem
> ./gems/sources-0.0.1
> ./gems/sources-0.0.1/lib/sources.rb
> ./specifications/sources-0.0.1.gemspec



razor:/opt/local/lib/ruby/gems dhaskew$ sudo gem install cache/ 
sources-0.0.1.gem
Attempting local installation of 'cache/sources-0.0.1.gem'
Successfully installed sources, version 0.0.1
razor:/opt/local/lib/ruby/gems dhaskew$ ls
1.8             cache           gems            specifications
razor:/opt/local/lib/ruby/gems dhaskew$ ls -l
total 0
drwxr-xr-x   6 root  admin  204 Jul 30 03:13 1.8
drwxr-xr-x   3 root  admin  102 Jul 30 11:54 cache
drwxr-xr-x   3 root  admin  102 Jul 30 11:54 gems
drwxr-xr-x   3 root  admin  102 Jul 30 11:54 specifications
razor:/opt/local/lib/ruby/gems dhaskew$ cd 1.8/
razor:/opt/local/lib/ruby/gems/1.8 dhaskew$ ls
cache           doc             gems            specifications
razor:/opt/local/lib/ruby/gems/1.8 dhaskew$ ls -l gems/
total 0
drwxr-xr-x   3 root  admin  102 Jul 30 12:12 sources-0.0.1
razor:/opt/local/lib/ruby/gems/1.8 dhaskew$ ls
cache           doc             gems            specifications
razor:/opt/local/lib/ruby/gems/1.8 dhaskew$



... above you can see where the gem was installed to by ports/ 
rubygems initially

when I reinstalled it locally, it installed it somewhere different.   
now I can issue my commands

razor:~ dhaskew$ sudo gem list

*** LOCAL GEMS ***

sources (0.0.1)
     This package provides download sources for remote gem installation