anymore unless you really know what you are doing. Choose stable (squeeze)
instead.
+Notice that you need to specify a mirror providing the lenny release, the
+default (http://cdn.debian.net/debian) doesn't provide it any longer nowadays.
+Set the mirror to e.g. http://archive.debian.org/debian/ if you don't have
+your own lenny mirror.
+
When installing lenny to a new mdraid, grml-debootstrap will use md metadata
format version 0.90. This limits the device to a maximum size of 2TB, but has
the advantage of grub-legacy actually being able to boot from it.