I must say that, it looks to me as if Linux does indeed have a future on the desktop.
This is based on several indicators.
1) the danish "public tv" channel (also the largest channel provider AFAIK) had a story about how a regular family switched their computers to using Linux - and how much money they saved. And after the family tried it for a few weeks, they followed up and the family decided to stay with linux on all computers but one - for gaming.
2) I own linuxpusher.com - which was mentioned in the aforementioned show - and got a LOT of orders for Linux (Ubuntu in this case) - and I often talk to normal people who want to try Linux - because their windows has gotten too slow etc. or they are just curious.
3) I recently installed Linux on my brothers computer, because his Vista didn't work properly with his 3G phone modem - Linux (Ubuntu 9.04) worked flawlessly - so he's still running Linux - without any help from me (the install was the only thing - and he could have done that himself easily).
So it seems to me as Linux is making inroads in to the desktop market - atleast in demark.. slowly, but still.