Easy Print is a new service in Windows Server 2008 which as long as you are connecting to a Windows Server 2008 machine, which basically sends all printer jobs to the local machine.

Say you are working remotely on a document on, lets say LHSERVER1 and your computer in front of you being LAPTOP2. You can edit the document and save it on LHSERVER1 but you need to print it to your machine sitting in front of you. This is where Easy Print comes in - instead of emailing the work to your email address so you can print directly from your laptop, it will allow you to print to the printer sitting next to you. This requires no drivers, no configuration, nothing special whatsoever.

From the Terminal Server blog on MSDN:

As of the 27th April 2007, the only platform that can be used as the client computer is Windows Longhorn Server Beta 3. More platforms will be available soon however. On the Longhorn Server Beta 3 client computer, the one additional step needed to ensure that printers are redirected over Easy Print is to install .NET Framework 3.0 (SP1). There are two ways to do this:

1.     Start - Administrative Tools - Server Manager - Add feature - .NET Framework 3.0
2.    You can also do it using the command line: pkgmgr.exe /iu:NetFx3

With this, all is set. We can redirect client printers as we used to normally by enabling the Printers checkbox in your Remote Desktop settings window (Local Resources - Local devices and resources). Redirected printers on the remote session will now be installed using Easy Print and do not require any configuration on the server by terminal server administrators.