Display Fusion 50% off - $12.59

You can also upgrade to the home version for $5

Binary Fortress via Facebook has all of their products 50% after using code "df-greenlight50". This ends December 3rd, 2012. You can try the product before you buy, I have used the free version for months and even the free version is good.( No ads, very functional, just cant use a few different features.)
http://www.displayfusion.com/Purchase/
Prices:
DisplayFusion Pro Standard License: $25 ($12.50)
DisplayFusion Pro Personal Home License: $35 ($17.50)
DisplayFusion Pro Site License: $645 ($322.50)
DisplayFusion Pro Enterprise License: $2500 ($1250)

This software is to manage wallpapers, start bar and settings across multiple monitors.
This software isnt on sale too often and the last post about it was last May.

Fantastic piece of software. I purchased this several months ago for full price and would do it again. Works great on Windows 7 and Windows 8 x86 or x64.

Been waiting for a deal on DisplayFusion! Thanks!

Yeah really useful software. And you can set hotkeys to lock your mouse to 1 monitor. So if you're gaming your mouse won't go onto your 2nd monitor by accident.

great software. I have been using it for quite some time since I needed a way to make my right monitor the primary one. I couldn't seem to find a way to get win7 to do this for me. I bought the home version for $18. thanks op! repped

it was posted couple days ago

http://slickdeals.net/f/5616766-D...-off-12-59

Maximum PC just had an article about "software worth paying for" and this made the list. I had a lot of the other choices already, so I'm sure I will agree with this one as well.

Seems to still be working. I've had this software for almost 3 years now and it's awesome for dual monitor setup. I would say, if you're already thinking about it, just buy it. Developer is awesome.