I picked up a 2big network a few days ago (to replace two Buffalo LinkStation Pros) and also have not been able to get an icon for the drive to appear on my mac desktop, despite being able to access the 2big through "Connect to Server." I hope to learn more from LaCie.
A successful workaround I'm using is to put the contents of each share on the 2big drive into a single folder in the share, make an alias of the folder in the share, and drag/copy the alias to the desktop of any machine needing access to the share. Admittedly a little kludgy, but easy to disseminate once set up. The desktop alias calls up the respective folder quite crisply, tested now for several machines on the network -- at least with up to ~40 Gb in a given folder/share so far. For reference, this network currently has 6 Mac and 3 Win XP nodes.