VirtualBox has been my favorite desktop virtualization tool for a couple years now. I love it so much because it supports variety of host and client OSes, USB support, and shared folder with the host. The fact that VirtualBox application itself and virtual machine images are portable between my Windows environment and Linux environment is the greatest feature for me.
However, there have been some issues that annoyed me a lot.
First issue was when you run multiple guests, sometimes it get frozen and you need to hard-reset your computer. This happened quite often and it was very annoying.
Second issue was its performance. It depends on what I do but it looks like sometimes it is way slower than it could be, especially when running multiple guests.
As soon as I notice the ticket was taken care of I downloaded VirtualBox 3.0.0 BETA2.
It has been only a couple days but I am already noticing that my 2 biggest issues are gone. It has not been crashing (VirtualBox processes become zombie processes) at all and it performs a lot faster.
I would like to thank all VirtualBox developers!!