+Stable (6.x series)
+~~~~~~~~~~~~~~~~~~~
+
+Based on current stable `Debian 6.0 (squeeze)`_ release. This VM
+provides a stable, well tested environment with the most of the recent
+releases available from NeuroDebian.
+
+* `NeuroDebian 6.0.6 image (32bit)
+ <http://neuro.debian.net/debian/vm/NeuroDebian_6.0.6_i386.ova>`_ [~559MB]
+
+ *This image should work on virtually all systems that are supported by*
+ VirtualBox_ *and can be used whenever the, otherwise preferable, 64bit image
+ is not compatible with a host machine.*
+
+* `NeuroDebian 6.0.6 image (64bit)
+ <http://neuro.debian.net/debian/vm/NeuroDebian_6.0.6_amd64.ova>`_ [~576MB]
+
+ *This image only works on 64bit host machines with active hardware
+ virtualization support. The should include all recent Apple hardware and most
+ 64bit Windows systems.*
+
+Development (to be 7.x series)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Based on upcoming `Debian 7.0 (wheezy)`_ release. Although already
+quite stable, there might be outstanding issues. This VM also
+switches from GNOME_ (v.2) desktop environment to XFCE4_. We
+recommend this VM over a stable one for anyone needing recent releases
+of tools not available for the stable VM (e.g. recent pandas) --
+**getting a complete "Scientific Python" stack with 100s of other
+Python modules was never easier**. Moreover your feedback might also
+be valuable to polish upcoming Debian wheezy release and NeuroDebian
+VM 7.0.
+
+* `NeuroDebian 6.999.b4.20121231 image (32bit)
+ <http://neuro.debian.net/debian/vm/NeuroDebian_6.999.b4.20121231_i386.ova>`_ [~656MB]
+
+* `NeuroDebian 6.999.b4.20121231 image (64bit)
+ <http://neuro.debian.net/debian/vm/NeuroDebian_6.999.b4.20121231_amd64.ova>`_ [~660MB]
+
+
+Historical
+~~~~~~~~~~
+
+Virtual appliances above carry guest additions for 4.x series of the
+VirtualBox. If you still have VirtualBox 3.x, use previous 6.0.2
+virtual appliances:
+
+* `NeuroDebian 6.0.2 image (32bit)
+ <http://neuro.debian.net/debian/vm/neurodebian_6.0.2_i386.zip>`_ [~545MB]
+
+* `NeuroDebian 6.0.2 image (64bit)
+ <http://neuro.debian.net/debian/vm/neurodebian_6.0.2_amd64.zip>`_ [~560MB]
+
+.. note::
+
+ This older virtual appliances are distributed as a `zip` file. Please
+ extract all files from the `.zip` file, using appropriate software
+ for your operating system.
+
+.. note::
+
+ You can verify that you have downloaded archives correctly using
+ `md5sums -c MD5SUMS
+ <http://neuro.debian.net/debian/vm/MD5SUMS>`_ . You can also verify
+ the authenticity of the `MD5SUMS
+ <http://neuro.debian.net/debian/vm/MD5SUMS>`_ itself using `gpg
+ --verify MD5SUMS.gpg
+ <http://neuro.debian.net/debian/vm/MD5SUMS.gpg>`_ signed with
+ NeuroDebian archive key.
+