While there's many Linux users looking forward towards the release of Ubuntu 11.04 "Natty Narwhal" tomorrow, having been released yesterday to the BSD world is DragonflyBSD 2.10.1.. This update to the DragonflyBSD operating system contains greater hardware support, including for multi-processor systems, among other enhancements.
Beyond the greater hardware support, there's much-improved ACPI support with interrupt routing support, significant performance improvements to the operating system itself, MP performance improvements by removing the MPLOCK, new network bridging functionality, upgrading the compiler to GCC 4.4, updates to Packet Filter, and de-duplication support to the HAMMER file-system. The performance improvements come from improving AHCI and swapcache along with other areas.
The DragonflyBSD 2.10 release announcement and download links can be found at DragonflyBSD.org