Rubygems - 404 Error for gems.datamapper.org/yaml

Hi everyone,
I’m at my wits end here. I’ve been trying to install a gem all day, but
Rubygems won’t let me because it keeps crashing while trying to update
gem metadata for some Datamapper gems.

I had originally added the gems.datamapper.org repo to my sources, but
now I can’t remove it, because…doh…Rubygems always wants to update
metadata BEFORE running any command.

I’m on Mac OSX Leopard using the normal Ruby 1.8.6 that came with the
box.

Below is a transcript of my trials and tribulations:

ca1-osx-l214:Library kodama$ gem install trollop
Bulk updating Gem source index for: http://gems.rubyforge.org/
ERROR: While executing gem … (Gem::RemoteSourceException)
HTTP Response 404 fetching http://gems.datamapper.org/yaml
ca1-osx-l214:Library kodama$ gem sources
*** CURRENT SOURCES ***

http://gems.rubyforge.org
http://gems.datamapper.org
ca1-osx-l214:Library kodama$ gem sources -r http://gems.datamapper.org
Bulk updating Gem source index for: http://gems.rubyforge.org/
ERROR: While executing gem … (Gem::RemoteSourceException)
HTTP Response 404 fetching http://gems.datamapper.org/yaml
ca1-osx-l214:Library kodama$ ping http://gems.datamapper.org/yaml
ping: cannot resolve http://gems.datamapper.org/yaml: Unknown host
ca1-osx-l214:Library kodama$ echo Oh noes

Can anyone point me in the right direction on this?

Thank you very much,
kodama

Ah:
http://groups.google.com/group/datamapper/browse_thread/thread/7f574a69fb8a64c3-------------------------------------------------------------------------------