Temporarily in the air is the CERNVM/Vboxwrapper Test Project at http://boinc.berkeley.edu/vbox/.

This is a rapid ALPHA project run by the BOINC developers and is geared towards finding and squelching as many bugs in the present BOINC + Virtual Box + VBox wrapper software as possible, on Linux, Windows and Mac OS X. This project is to be burned when it has run its course, we're in it for the bug fixes rather than the credits. Credits export is not on, isn't going to be enabled either.

Think you want to give us a hand in helping out? You're more than welcome.
Requirements though:

-- BOINC 7.0 available from http://boinc.berkeley.edu/download_all.php.
-- Virtual Box installed on your system from https://www.virtualbox.org/wiki/Downloads.

Be careful for the initial download. What though was 1.61GB is now 260MB (compressed). But still, if you think that's too much or too taxing for your bandwidth, then please don't try.
Post about any and all bugs you come across on the project's forums, or on the BOINC Alpha email list.