How do I spawn mobs in SMP?
Solution 1:
As of release 1.1, you can enter Creative mode and use the new "Spawn Eggs" item to produce monsters, even in vanilla.
Solution 2:
You can do it in bukkit with the /mob
command.
http://dev.bukkit.org/server-mods/admincmd/pages/mob-commands/
http://dev.bukkit.org/server-mods/admincmd/
Solution 3:
I spawn eggs on my server (it's vanilla, not Bukkit!) with /give (name) 385 (mob id)