Steve Herrod just announced the in my opinion the best fling so far on twitter.
Run vSphere client 4.1 in a snap. No install, just download the EXE and double-click. Place the ThinApped vSphere client on any network share and it will automatically stream to any Windows PC with no installation, agents, drivers, or specialized servers required. Carry ThinApped vSphere client and your customization on USB stick and now your vSphere client is available on the GO!
This fling uses VMware ThinApp to package vSphere Client into a single portable EXE giving you instant access to your virtual infrastructure from any computer. ThinApp has been used by corporate administrators to deploy thousands of applications to millions of desktops. Use VMware ThinApp to create your own virtualized applications, for more information visit the VMware ThinApp page and watch the ThinApp Blog.