If you like bringing pictures into your writing to buttress your flights of imagination (though not including them in the finished story) this could be worth checking out. It's free, and you can use any pics you like, photos, drawings or sketches of a situation, and then add some text around it to organize persons and storylines: nin pictures w/ text to a page.If you print out some pages and have one with people.one with locations and a few more with key episodes it should be helpful - and it's a piece of cake to chang around (you cn only view one page on screen at one time, though)

http://www.softlookup.com/display.asp?id=4932

It would be useful too, if you plan doing animated movie shorts with bdsm content.