Today, qemu maintainers have announced the creation of a stable qemu 0.10.0 branch. The new stable branch includes many features, of which the major ones are listed below. Most hypervisors which employ qemu for userspace use a modified version qemu. KVM also started this way but KVM has been aggressive at merging their changes into upstream qemu. One of the notable inclusions with this latest branch is support for kvm.

The official announcement can be found at the following link:

http://www.mail-archive.com/kvm@vger.kernel.org/msg11287.html

The official changelog for qemu-0.10.0 follows:

- TCG support (No longer requires GCC 3.x)
- Kernel Virtual Machine acceleration support
- BSD userspace emulation
- Bluetooth emulation and host passthrough support
- GDB XML register description support
- Intel e1000 emulation
- HPET emulation
- VirtIO paravirtual device support
- Marvell 88w8618 / MusicPal emulation
- Nokia N-series tablet emulation / OMAP2 processor emulation
- PCI hotplug support
- Live migration and new save/restore formats
- Curses display support
- qemu-nbd utility to mount supported block formats
- Altivec support in PPC emulation and new firmware (OpenBIOS)
- Multiple VNC clients are now supported
- TLS encryption is now supported in VNC
- MIPS Magnum R4000 machine (Hervé Poussineau)
- Braille support (Samuel Thibault)
- Freecom MusicPal system emulation (Jan Kiszka)
- OMAP242x and Nokia N800, N810 machines (Andrzej Zaborowski)
- EsounD audio driver (Frederick Reeve)
- Gravis Ultrasound GF1 sound card (Tibor "TS" Schütz)
- Many, many, bug fixes and new features