As always, Parallels Desktop 8 helps keep your virtual environments safe through the use of Snapshots. The feature lets you to take a snapshot of your Windows system (for example) when it's in a healthy state so if you encounter any viruses or spyware while surfing, you can essentially rewind to your previously saved snapshot. This is extremely helpful for testing beta software and makes sure you have an option when dangerous Trojans or spyware infect your virtual system.
Overall, Parallels Desktop continues to offer a seamless experience for switching between virtual OS machines and a number of extras that let you take full advantage of Windows apps you need or are used to working with in your particular work environment. Though there are a lot of virtualization options available, Parallels has a tool set and new usability features that puts it above other offerings.