I have the same problem. They still show in the finder, is it possibel to change the mounts? I.e. take out the 'a' (which is supposed to mount all -> mount -vt? Or would that be bad for the system? Is it possible to mount other harddisks in the file system as well with this method?

Best, Rob

This seems to do the trick for me:

First, take out these lines from /etc/rc:

##
# Hide unneeded volumes from the desktop.
##

/Developer/Tools/SetFile -a V /Applications
/Developer/Tools/SetFile -a V /Users
/Developer/Tools/SetFile -a V /Swap
#Uncomment this if you're putting mail onto it's own partition.
#/Developer/Tools/SetFile -a V /var/mail

Next, give the following command in the terminal:

sudo /Developer/Tools/SetFile -a V /Users

(I only made a separate /Users partition, but I guess the same goes for the other partitions.)
And funny enough it stays the same after restarts. No need to put it in the /etc/rc file!

The only thing is that your /Users folder looks like a shortcut to a server, I see no way to change that...