MaxiVista is a dual monitor software and can turn your spare Laptop or Tablet PC into an extra monitor for your primary PC:
laptop as a monitor
Your productivity will be increased instantly - Toolbars and program windows can be moved and extended across both screens as as if it were one big monitor. Connect up to four PCs via network and enjoy the extended desktop real estate
**NO WIRES NEEDED, only router!**
VERY cool, and it works great!!
heres the download:
http://www.maxivista.com/maxivistademo.zip
and more info if u guys wanna check it out
http://www.maxivista.com
EDIT: MAKE SURE U READ THE SYSTEM REQUIREMENTS.
System requirements
MaxiVista runs flawlessly on any combination of current Desktop/Laptop/Tablet PC models:
Primary PC: Microsoft Windows 2000/2003/XP (with or without SP2)
Secondary PC: Windows 98/ME/NT4/2000/2003/XP (with or without SP2), Linux with Wine.
TCP/IP Network connection between the PCs
3 MB hard-disk space
Optional: Free Adobe Acrobat Reader to read and print the offline manual
Optional: Internet access to download future product updates
MaxiVista with existing Multi Monitor systems
As the Windows XP/2000 Display Manager supports up to 10 displays per PC, the biggest possible setup would consist of 7 hardware displays running at any possible screen resolution on the Primary PC plus 3 Secondary PCs with each up to 3,200x1,200 pixels, which can be shown on a suitable amount of hardware displays attached to each Secondary PC (usually two monitors, each displaying 1,600x1,200 pixels).
enjoy!