If you could allow the user to specify the command char, it would be awesome. Great work, though!
GleeBox looks great. Echoing another posters comments, the mouse-centric navigation of the web really gets to me. Anything that lessons mouse usage gets my vote!
2. Searching google and other search engines without going through yubnub command (eliminate the extra HTTP get). I know i can search google through the address bar and the search box on top right, typing 'g' is much easier than command+L and command+K.
3. ability to pin/unpin the gleebox so it does not disappear despite http refresh when I open a link in the same tab.
For #3, we experimented with a hyperglee mode. In that mode, gleeBox shows up automatically when you open a page. It actually exists but is an undocumented feature (since we weren't completely satisfied with the results) :)
In Chrome, you can turn the hyper mode on/off by executing '!set hyper=on/off'. Doesn't work too well in Firefox, though.
lo::facebook (could use your save username/password in firefox) or lo:facebook -u username -p password
Since many a times the login page on websites is uninteresting