A few questions.  No ideas... yet.
1) Division of land.  Who will control the parceling out of land?  
  Exactly how would this 'beacon' idea work?  Would every server be a beacon,
  maintaining a list of nearby beacons?  Will there have to be a two-way 
  link?  For instance, in a Mush, a room can have an exit to another 
  room, but the other room doesn't necessarily have an exit going back.
2) Another problem; how can you be sure that someone doesn't occupy your 
  space?
3) Looking out the window.  When looking into an adjacent server's front 
  lawn, would the client connect the the adjacent server, or would the 
  current server somehow have a 'copy' of the front lawn?
4) Interaction of objects between servers.  Would this be handled?
Etc.?
----
"If I had just half a brain, it'd be quite painful..."
    --<"blat"	"nrg"	"frog"	 "b0b"	 "NiN">--	-Jimmy "rar!" Dang
"But look on the bright side, I'd have a Head Like a Hole!"     %-)