Virtualbox now portable...

How to install Portable VirtualBox

1. Download Portable VirtualBox from Portable-VirtualBox
   
   
2. Run the executable and extract the files to your USB drive
   
3. Go to the Portable-VirtualBox folder and click Portable-VirtualBox.exe
   
   
4. Now Select the Options based on your requirements and click “Download installation file of VirtualBox”.
   
5. Click “OK” to copy the files to the USB drive
6. Run Portable-VirtualBox.exe from the drive to start portable VirtualBox
7. Voila, you can now select and run any OS as a guest OS on your machine

PS: this was tested on Ubuntu 9.10 using Wine... No problems to report.