A free, simple undocking app for Thunderbolt Display (and non-thunderbolt) users...

If you are using a Thunderbolt display and have several external drives, it can be a pain to undock all of the external drives when you want to unplug the monitor. Here is a link to an app that can undock it for you. I've tested it on Lion. If you like it please leave a comment on the blog. Thanks!

http://chompingatbits.com/2011/09/23/undocking-from-an-apple-thunderbolt-display /

Just download the app. Then run it anytime you want to eject all of your external drives.