My most common tunings are drop-D on six string (DADGBE) and bass (DADG), and my own hombebrewed double-drop-G on seven string (GDADGBE). I'm trying to move to DADGAB full-time on six string. Maybe it will take.
Beyond that, I'm pretty much known to change tunings all over the place on a whim, even restringing the instrument and changing the order of the guages all over the place. This is a list of odd tunings I have used in the past couple of years, all progressive (i.e. each one is based on a previous one). It is by no means canonical; I need to go back through my old diaries and find other weird tunings to post here...