As I'm so excited about this idea I just posted on the plugin wishlist
(http://plugins.intellij.net/wishlist/item/?wid=110) I decided to advert it here.
Please forgive me! Anyway.
Mac-Users know what I'm talking about (http://quicksilver.blacktree.com/)
If you don't know Quicksilver you can think of the proposal as a kind of
context-sensitive popup command line
giving access to more or less the complete functionality of IDEA.
What do you think of this idea? (Some details are contained in the wishlist proposal, linked above.)