I posted this bit in another discussion so please forgive me if this counts as spam but the best solution I've found for windows issues is GridMove
(link). I even made grids for it here:
(link). I like this way better than Matrox's software (which I no longer use).
Also, some games that only do vert- (like Guild Wars) are not too bad in a window. I was running Guild Wars two screens wide but centered. This left space on either side for: the taskbar (on the left edge rather than the bottom), Skype (using the first half of the left screen) and a browser window showing GuildWiki on the right screen (which only partially covered my game screen when the browser was in the foreground). (See the above link to my Grid file)