The current stable version of the Globus Toolkit is 2.4. According to the Globus Project the Replica Location Service (RLS) update is not included in the current 2.4 stable release due to licensing issues.
The current experimental version of the Globus Toolkit is 2.5. The
experimental version is intended to allow interested organisations to test and
experiment with new code prior to the code's appearance in a stable release.
The Globus Toolkit 3.0 alpha 3 release is intendeded for early testing and experimentation with OGSI-based Grid Services.
Globus expects a beta release of 3.0 this month. In July the first stable production version is expected. It will include all of the features of the 2.4 stable release, plus an open source implementation of OGSI.