Thin Client - Remote Access Computing Solutions

Citrix
http://www.citrix.com/lang/English/home.asp
Citrix Systems Inc. (Nasdaq:CTXS) is the global leader and the most trusted name in application delivery infrastructure. More than 180,000 organizations worldwide rely on Citrix to deliver any application to users anywhere with the best performance, highest security and lowest cost.

Microsoft
http://www.microsoft.com/windowsserver2003/technologies/terminalservices/default.mspx
Terminal Services in Windows Server 2003 provides new options for application deployment, more efficient access to data over low bandwidth, reuse of older hardware, remote management, and other tasks.

VMware - VDI
http://www.vmware.com/solutions/desktop/vdi.html
With VMware Virtual Desktop infrastructure (VDI), companies can host individual desktops inside virtual machines that are running in their data center. Users access these desktops remotely from a PC or a thin client using a remote display protocol. Since applications are managed centrally at the corporate data center, organizations gain better control over their desktops. Installations, upgrades, patches and backups can be done with more confidence without user intervention.

Wyse
http://www.wyse.com/
Wyse provides the hardware, software, and services that shift computing complexity to the network, liberating IT departments from unnecessary support and maintenance functions, empowering users to be more productive in their jobs, and protecting and improving access to critical information and business applications.