ahh yes, the ole workgroup model.
I think this is your answer
you can put a vbscript in their "startup" program group that will silently map the drive for them. you can map to a folder within a share with windows 2000. what that means is you can have
{vbscript for net use} \\server\share\folderx
where "folderx" is the variable for the %username%
that way, the users only sees his folder, and you don't have to have a million shares configured on your server.
just have to set the permissions correctly on the server
a vbscript snippet shouldn't be that hard to find
Fred