Windows on Linux = Wine

If you need Windows application being executed or installed in GNU/Linux platform, definetly you need Wine application to do that. Wine will try to emulate some of Windows DLL (Dynamic Link Library) files into GNU/Linux's specific runtime environment, so that it will make your GNU/Linux platform look like Windows. If you install Wine, it will create a fake Program File and Windows directories. This is where you will install your applications and the dll's required stays.

Wine is not finish yet (and i doubt if it will finish this year, since this is a big project and need a lot of testing and updates, since Windows application is rapidly increasing). Wine developers will try to do their best to make all application can be installed or executed via Wine, but there are no guarantee that they will make them as soon as you ask them. They divide into two categories, Gold and silver list. Applications which install and run virtually flawless on a out-of-the-box Wine installation make it to the Gold list, while The Silver list contains apps which we hope we can easily fix so they make it to Gold status. You can see the list on WineHQ's application website.

Another site that publish information about installing Windows application using Wine is http://frankscorner.org/. This page discuss an advanced way to install some popular Windows application, such as :

Application:
AutoCAD R14
Dreamweaver MX
Flash MX
Internet Explorer 6.0 SP1
MS Office 2000
Nero Burning Rom 6.0.0.9
Paintshop Pro 8
Photoshop 7.0

Games
Diablo 2
Grand Theft Auto: Vice City
Jedi Knight 2: Jedi Outcast
Half-life
Simcity 4
Soldier Of Fortune 2
Starcraft
Warcraft 3
Warcraft 3: Frozen Throne

Now you can play Warcraft 3 with your friend while you boot at your GNU/Linux :)
Have fun with Wine...