If you haven't used it, virtual box is a free VM that works very well.
Available for Win, Mac, Linux, Unix.
Very nice update for a free program.
http://www.virtualbox.org/wiki/Changelog
VirtualBox 2.1.0 (released 2008-12-17)
This version is a major update. The following major new features were added:
* Support for hardware virtualization (VT-x and AMD-V) on Mac OS X hosts
* Support for 64-bit guests on 32-bit host operating systems (experimental; see user manual, chapter 1.6, 64-bit guests, page 16)
* Added support for Intel Nehalem virtualization enhancements (EPT and VPID; see user manual, chapter 1.2, Software vs. hardware virtualization (VT-x and AMD-V), page 10))
* Experimental 3D acceleration via OpenGL (see user manual, chapter 4.8, Hardware 3D acceleration (OpenGL), page 66)
* Experimental LsiLogic and BusLogic SCSI controllers (see user manual, chapter 5.1, Hard disk controllers: IDE, SATA (AHCI), SCSI, page 70)
* Full VMDK/VHD support including snapshots (see user manual, chapter 5.2, Disk image ?les (VDI, VMDK, VHD), page 72)
* New NAT engine with signi?cantly better performance, reliability and ICMP echo (ping) support (bugs #1046, #2438, #2223, #1247)
* New Host Interface Networking implementations for Windows and Linux hosts with easier setup (replaces TUN/TAP on Linux and manual bridging on Windows)
In addition, the following items were ?xed and/or added:
* VMM: signi?cant performance improvements for VT-x (real mode execution)
* VMM: support for hardware breakpoints (VT-x and AMD-V only; bug #477)
* VMM: VGA performance improvements for VT-x and AMD-V
* VMM: Solaris and OpenSolaris guest performance improvements for AMD-V (Barcelona family CPUs only)
* VMM: ?xed guru meditation while running the Dr. Web virus scanner (software virtualization only; bug #1439)
* VMM: deactivate VT-x and AMD-V when the host machine goes into suspend mode; reactivate when the host machine resumes (Windows, Mac OS X & Linux hosts; bug #1660)
* VMM: ?xed guest hangs when restoring VT-x or AMD-V saved states/snapshots
* VMM: ?xed guru meditation when executing a one byte debug instruction (VT-x only; bug #2617)
* VMM: ?xed guru meditation for PAE guests on non-PAE hosts (VT-x)
* VMM: disallow mixing of software and hardware virtualization execution in general (bug #2404)
* VMM: ?xed black screen when booting OS/2 1.x (AMD-V only)
* GUI: pause running VMs when the host machine goes into suspend mode (Windows & Mac OS X hosts)
* GUI: resume previously paused VMs when the host machine resumes after suspend (Windows & Mac OS X hosts)
* GUI: save the state of running or paused VMs when the host machine?s battery reaches critical level (Windows hosts)
* GUI: properly restore the position of the selector window when running on the compiz window manager
* GUI: properly restore the VM in seamless mode (2.0 regression)
* GUI: warn user about non optimal memory settings
* GUI: structure operating system list according to family and version for improved usability
* GUI: prede?ned settings for QNX guests
* IDE: improved ATAPI passthrough support
* Networking: added support for up to 8 Ethernet adapters per VM
* Networking: ?xed issue where a VM could lose connectivity after a reboot
* iSCSI: allow snapshot/diff creation using local VDI ?le
* iSCSI: improved interoperability with iSCSI targets
* Graphics: ?xed handling of a guest video memory which is not a power of two (bug #2724)
* VBoxManage: ?xed bug which prevented setting up the serial port for direct device access.
* VBoxManage: added support for VMDK and VHD image creation
* VBoxManage: added support for image conversion (VDI/VMDK/VHD/RAW)
* Solaris hosts: added IPv6 support between host and guest when using host interface networking
* Mac OS X hosts: added ACPI host power status reporting
* API: redesigned storage model with better generalization
* API: allow attaching a hard disk to more than one VM at a time
* API: added methods to return network con?guration information of the host system
* Shared Folders: performance and stability ?xes for Windows guests (Microsoft Of?ce Applications)
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