Send an Open Source Project to COMDEX
chromatic writes "O'Reilly & Associates is working with COMDEX to create an Open Source Innovation Area. We've nominated 21 important, interesting, and useful applications. Here's your chance to vote on the six most deserving applications. Steve Mallet has more details in his weblog." There's lots of good choices for applications on the list as well. Chances are that you've used one of them at least once.
If you're dealing with an office worker, OpenOffice and Evolution are good candidates. Home users would like to see XMMS, mplayer, GAIM, and SpamAssassin. Admins would be interested in Tight VNC and SpamAssassin. The creative types would want GIMP and Audacity.
As for the desktop, it might be a good idea to stick with one for all your demonstration boxes (all KDE or all GNOME) but of course mention that alternatives exist.
Um no, that's a very common refrain.
Look at Linux, Apache, OpenOffice, KDE, Mozilla...
for each of them, there is a pre-existing closed-source project that it can be called a "clone" of.
In fact, when RMS was initially starting the "Free Software" movement, he explicitally declared they would clone Unix:
That seminal message suggests that cloning an existing program will be vastly easier than making a new one, because since there's little original thinking involved, the communication needs between distributed developers are much, much smaller.