MTCOBRA  This is a very useful program. However it works only with Finder windows. Since I have started using Path Finder, this program no longer is of any use to me. I am keeping my eye on this, however, in the event the developer makes it workable with Path Finder.  
(Version 3.0)

DAREALGREG  I was a user of version 2 but had to stop using as it required access for assistive devices to be turned on in Universal Access. Unfortunately I am required to run a third party application that acts up when this feature is turned on. This new version no longer requires this so I am excited to pay my upgrade fee.   
(Version 3.0)

EASER  I rather like this. I use a lot of different split-pane settings, and this lets me choose them quickly. The program works very well. I was in the midst of trying it out when I experienced a glitch from another program that was severe enough to prompt me to erase my drive and reinstall everything. (Let me be very very clear - Simple WindowSets did NOT harm my system. It was something totally unrelated.) Anyway, I had saved my preferences for SWS, and afer reinstalling, the program still remembered all of my previous settings perfectly. I was sold on it.  
(Version 1.2a)

BILL CLINTON  This looks promising. Finder Window Manager does similar things but despite its feature bloat, does not let you update a window set. Simple WindowSets appears to allow that.  
(Version 1.2)