I am an avid Fluxbox WM user ...

The Fluxbox Window Manager is closely based on Blackbox WM.

Fluxbox WM and Openbox WM - can use the xorg-system-core, with NO desktop environment.  Much like what Crunchbang and Archbang have done.

Fluxbox is still closely based on Blackbox.  Some say that, Fluxbox is the natural progression of Blackbox.  Fluxbox is a basic Blackbox; with a few more things added for user-friendliness.  Not to take anything away from the base-Blackbox build ... the BB-Devs did an awesome job.  I use many of the BB scripts, themes/styles and apps with Fluxbox -- they seems to be pretty much forward and backward compatible.

Openbox, was also, based on Blackbox but has grown more separate from the BB-base, with using and building it's own configs and apps.  Although, Openbox seems to be growing in popularity, with more Linux OS-distro systems using Openbox - as the default Window Manager.

There are advantages, pros and cons, to using either Openbox and/or Fluxbox.

Fluxbox has:
A self-updating 'right-click' Menu
It's own Fb-panel/taskbar (no need for tint2)
A built-in Composer
Does not use a GUI or .xml files but everything is a simple Script
Easy to use and Configure.
There are already hundreds of fb-styles (themes) available.
As light-weight on resources (or lighter) than using Openbox.

Hey, guys ... you might recognize me from the #!Crunchbang or LinuxMint Forums.

I have been a Linux user for several years.  Started with Fedora way back when. Moved to 'buntu for about 2 days, then found LinuxMint. A short while later discovered Crunchbang (Ubuntu-based).  Now, I only use Debian or Debian-based Distros.

I used the Xfce DE almost since my 1st day with Linux. Now, I primarily use either Openbox or Fluxbox WMs.

I am a Moderator for a couple of Forums - LinuxMint Forum, LostintheBox (Fluxbox) Forum and Ask.Debian.net
Also, an official Debian-Maintainer for the Fluxbox WM package.  Check out my work at http://vrkalak.deviantart.com

Since, Wheezy/Waldorf went into the 'freeze' I switched my sources.list to reflect the Sid repros, just to play around.
I am discovering that I rather like Sid (unstable).  After Wheezy/Waldorf goes stable, I might just keep this install of Sid on-hand and have another partition with a 'stable+backports' Debian on it (for work).

I just downloaded the lated ISO for VSIDO -- going to play around a bit.  Looks promising.