Fabio Erculiani has announced the release of Sabayon Linux 5.3, a Gentoo-based distribution for the desktop with custom package management and many cutting-edge features: "The best, refined blend of GNU/Linux, coming with bleeding edge edges is eventually here - say hello to Sabayon 5.3, available in both GNOME and KDE editions. Features: based on the new GCC 4.4 and glibc 2.10; shipped with a desktop-optimized Linux kernel 2.6.34; provides extra server-optimized and OpenVZ-enabled kernels in repositories; installable in 10 minutes; fast boot time and lightweight default system; official Btrfs file system support; features X.Org 7.5 and up-to-date open-source, NVIDIA, AMD video drivers; contains GNOME 2.28 (with GNOME Shell) and KDE 4.4.3...."
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Anne Nicolas has announced the availability of the second and last release candidate for Mandriva Linux 2010.1: "As announced previously, here comes the last development release for Mandriva Linux 2010.1. This is essentially a bug-fix release. Again ISO images are available on all public mirrors: 32-bit and 64-bit DVD images and mini dual-architecture ISO images for 'Free' release (100% open-source software); 'One' live CD images for KDE and GNOME environments. These ISO images can be fully tested on your hardware but also on virtual machines (VirtualBox, QEMU, KVM). You can also dump it on USB key as an installation media."
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From Distrowatch.com

Mandriva has announced the availability of the release candidate for Mandriva Linux 2010.1, the last test build before the final release scheduled to arrive early next month: "Here comes the last development release of Mandriva Linux 2010.1. A few days left now before final release planned for 3rd of June. These ISOs are available on all public mirrors: 32-bit and 64-bit DVD images and mini dual images (both 32-bit and 64-bit) for 'Free' release (100% open-source software); live 'One' images for KDE and GNOME environments. These images can be fully tested on your hardware but also on virtual machines (VirtualBox, QEMU, KVM). You can also dump them on USB keys as an installation media."
From Distrowatch.com

Following a large number of updates, the Slackware "current" tree has now become release candidate 1 (RC1) for the upcoming Slackware Linux 13.1: "We will call this update Slackware 13.1 RC1. With this, the kernel, compiler, and glibc versions are 'golden', and everything is pretty much ready to release. Last call for bug reports..." Some of the recent updates include Linux kernel 2.6.33.4, GCC 4.4.4, CUPS 1.4.3, Emacs 23.2 and GNU Diffutils 3.0. Several security and bug fixes have also been added: "Fixed Apple USB keyboard support. Added missing BCM57* firmware. Scan /dev/sr0 first when looking for CD/DVD, not the old IDE device."
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From Distrowatch.com