Following on from the problems that Eclipse users were experiencing with Java 6 Update 21, Oracle has rebuilt the release. If you look at the release notes it's now up to build 7. This build regresses the rebranding of the files' Company Name from "Oracle" back to "Sun Microsystems, Inc.".
This should mean that any Eclipse users who haven't upgraded to Java 6 Update 21 won't notice any problems when they do and for those who started using build 6 you can just download and reinstall with the latest Java update. It also gives Eclipse (and any other similarly affected applications) a chance to update their code in time for the release of JDK 7 when the rebranding changes will go ahead.