Redmine 1.0.3 has been released to Rubyforge. This a bugfix release for all Redmine 1.0 users. 35 changes have been added since Redmine 1.0.2 so this this should be a very stable release. Upgrading is recommended for all 0.9.x and 1.0.0 users.
The upgrade documentation will help you perform the upgrade. If anything goes wrong or you need help, feel free to post in the forums or IRC channel.
Upgrade Note: 1.0.3 includes some updates for both the Redmine.pm and reposman.rb scripts. If you are using these for the Advanced Subversion Integration, make sure to update them at the same time.