Then I sort of discovered Google Desktop for Linux. I installed Google Desktop as an exercise of my Linux command line skills but I uncovered a feature in it that sort of mimics some of the functions of QuickSilver.
By configuring Google Desktop to respond to the key combination Ctrl-Shift, Google Desktop will open a "Quick Search Box" and by typing the program I want to run on that search box I can scroll down to my desired application and run it without having to go through Eee's "start" menu!
Using this, Google Desktop filled my need to quickly launch applications a-la QuickSilver and it should suffice for my needs now.
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