Mac OS X VirtualBox and Shared Folders

I use eclipse to play around with some ruby/php/jsp code. And usually that’s ~/Projects/workspace/my_site
Now, let’s assume that I would like to host these files off my Ubuntu guest OS… What do I do?
1. Add the folder in “Shared Folders” screen as seen on the screenshot.
2. Boot the guest OS up and run this command:

root@virtuozo~$ mount [...]

VirtualBox on Mac OS X and port forwarding

I’ve been using VirtualBox for some time already, and frankly speaking I’ve got no problems.

I am able to run Linux & XP Pro guests.
Seamless mode is working fine after installing “Guest Additions”
Shared folder is working fine, the “/var/www/my_site” is mounted from Mac_OS_X->Projects/workspace/my_site, basically my development environment is Mac, whereas the LAMP stack (apache2 + postgresql) [...]