This only appears to have started in the past day or so. I initially
noticed a problem yesterday after a gem update(--system, I think)
started giving me errors when I'd attempt to "rake migrate" and then
updated today in hopes it'd fix it and now it's even worse.

Here's the error:

/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:477:in
`const_missing': uninitialized constant XSD::NS::KNOWN_TAG (NameError)

I'm assuming there's not much I can do about it right now but just
making sure I'm not doing something wrong...