The KDE Community is happy to release the fourth Beta for KDE 4.0. This Beta aimed at further polishing of the KDE codebase and we would love to start receiving feedback from testers. At the same time, a Release Candidate for the KDE 4.0 Development Platform is released. This Development Platform contains the bits and pieces needed to run and build applications using KDE 4 technology. The purpose of this Development Platform is to make it easier for third parties to port their applications to KDE 4, without having to wait until the full desktop is polished enough for the final 4.0 release.
http://dot.kde.org/1193780926/