RubyGems 1.0.0 Released
Eric Hodel has just announced the release of RubyGems 1.0.0. As you probably already know, RubyGems is the de-facto package / library manager for Ruby applications and libraries, and almost every Ruby developer will have a version installed. There aren't many new features with this major version release, but lots of fixes, tweaks, and stability and usability enhancements. One key thing to note, however, is that require_gem is no longer supported, so if you have code that depends on that, you will have a little work to do before upgrading.
If you're on RubyGems 0.8.5 or later, then you can upgrade easily with: gem update --system .. for older versions or people with no RubyGems installation so far, follow the instructions in the announcement.
Congratulations are due to Eric and everyone else who's worked on RubyGems so far for producing what is, in my opinion, one of the most essential Ruby tools out there.
(Update: I have seen some reports of problems regarding upgrading on Leopard and Ubuntu - 64 bit. You might want to read the comments on this post first and/or do some non-production testing to clarify issues on your own kit.)