Features:
Claimed regions are protected from other players placing/breaking blocks/lava/water
Unauthorized players cannot open chests in claimed regions
Automatically claim a chunk by placing 16+ blocks in it
Prevents creeper explosions if they would affect a claimed region
Right-click with 'String' (now configurable) to get chunk info
Right-click with 'Feather' (now configurable) to unclaim a chunk (arg.bypass allows unclaiming of others' chunks)
Commands:
/arg claim
Claim the chunk you are standing in
/arg info [<world> <xvalue> <zvalue>]
Get info about the chunk you are standing in or specified
/arg unclaim [<world> <xvalue> <zvalue>]
Unclaim the chunk you are standing in or specified
/arg friends
Displays your list of friends
/arg addfriend [playername]
Adds a friend to your friends list
/arg removefriend [playername]
Removes a friend from your friends list