a dual monitor setup is so useful. i usually have my main app (IE, Word, etc) in monitor one which is directly infront of me, then have all the smaller windows (winamp, bit torrent, etc.) running in the other to quickly view their status. it is especially usefull for programmers and graphics designers, as you can easily view source code and such without shitfing focus.
right now i have a second monitor (1280x1024) hooked up to my laptop (1600x1200) which i otfen take to university. it does not take long to setup while i'm at home. i'm looking for a good program that can easily switch between single and dual monitors, and can handle other display properties like wallpaper, color depth, resolution and such.
i know there's a lot of software which can manage the dual system. i'm using UltraMon at the moment which has some cool features.
What other programs do you use and are worth checking out?