April 22nd, 2011
· Scientific Linux 4.9 contains almost 2 years of security and bug fixes. There are no new features or packages, but it is a nice stable release.
· Scientific Linux release 4.9 is based on the rebuilding of RPMS out of SRPMS's from Enterprise 4, including Update 9.
September 4th, 2008
· Scientific Linux 4.7 has been released. It doesn't have any exciting new features, it is just a nice, stable release. Scientific Linux release 4.7 is based on the rebuilding of RPMs out of SRPMs from Enterprise 4, including Update 7. It also includes all errata and bug fixes up until September 03, 2008.