I *love* keyboard shortcut keys, I use them all of the time I actually come from a UNIX/DOS background and I love the command line. Using the mouse is really only that great for web browsing in my opinion. That being said I just wanted to pass on a keyboard shortcut that I just remembered for Office Communicator 2005: Windows Key-Q (Win-Q).
This will open Office Communicator and take you to the "Find" field so you can type in someone's name or a phone number. I love it because I keep Communicator minimized to the tray all of the time and this just brings it up faster than I could find the button and click it. Try it out!