Wow! there's a lot of collective know-how here! I would have taken my 2100 back almost as soon as I got it if not for these people on this forum!
I think a bonjour service should be relatively easy, and very useful. It's built in to many devices already, such as various printers and network-connected music players. A number of web-browsers (at least, for macs) have built-in bonjour discovery, so that all bonjour enabled web-servers can be accessed from a drop-down menu. This could certainly be a nice feature for the media gallery.
I'm sure there are opponents of zero-conf type of services, but I really find they can make things convenient.
For me, it would have the particular benefit ( I think) of making the n2100 show up in the mac network browser without having to have appletalk enabled. Apparently the n2100 uses afp on appletalk, which is no longer necessary, since (AFAIK) afp has run over tcp/ip for quite a while now.
I can only assume that this would work, since all the macs in my network advertise their afp sharing services with appletalk disabled, and they all show up in the network browser automatically.