A key piece of software for many OpenSolaris 2008.05 users is VirtualBox. Some use it to run OpenSolaris as a guest operating system, others install VirtualBox on OpenSolaris in order to run other operating systems as guests. I'll be writing more about VirtualBox in future posts and there is now a blog devoted to collecting posts about VirtualBox.
There are some limitations to be aware of, particularly when running OpenSolaris as a guest operating system under VirtualBox. The biggest one for me is that in the current release of VirtualBox (1.6.2), there is no support for sharing folders with an OpenSolaris guest.