Not sure, here's some of the main features:
Mandrakelinux 10.0 features the following software:
Kernel 2.6.3

XFree86 4.3
Glibc 2.3.3 with Native POSIX Threads Library (NPTL) support
GCC 3.3.2
Apache 2.0.48, Samba 3.0.2, MySQL 4.0.18
ProFTPD 1.2.9, Postfix 2.0.18, OpenSSH 3.6.1p2
KDE 3.2, GNOME 2.4.2, IceWM 1.2.13
OpenOffice.org 1.1, KOffice 1.3, Gnumeric 1.2.6
Mozilla 1.6, The GIMP 1.2.5, XMMS 1.2.9
Kinda supprised XFree86 4.3 is in there with so much fuss about the licence.
Nope dont have to be a member of anything now, it was released a few weeks ago to only club members, now to the general public.