GA stands for General Availability. It’s really a designation that means “real commercial release” and separates it from the EA, or early adopter versions.
The latest release of MyEclipse is 2.5.0 GA and supports both Eclipse 2.1.0 and 2.1.1, so you don’t need to upgrade your Eclipse installation. When you upgrade, please be sure to strictly follow the upgrade instructions in the FAQ section and that have been posted in this forum to minimize any complications.
–Scott
MyEclipse Support