Select a region:
Selection consists of two points - top left (1) and bottom right (2) corners

!we <setpos|pos> <1|2> <map x-tile> <y-tile>
or
!we pos <1|2> me      (sets to your position)
or
!we pos <1|2> pl <ID of player>
or even better and easier
!we pos <1|2> cur     (sets to your cursor position)

For example I want to make a 5*10 selection:
!we setpos 1 0 5
!worldedit setpos 2 10 10

We've selected a region and now we can change tiles of this selection with this command:
!worldedit set <tile>

It will fill the whole selection with the given tile (see screenshot)

Check the list of commands, you can do much more than replacing everything to a single tile!

There're no unstuck commands yet, so be a little careful

<> - required arguments
[] - optional arguments


!we limit <limit>
     // you cannot change more tiles in a single operations than <limit>
     // has default config option

Selection:

!we pos <1|2> <map x-tile> <y-tile>
!we pos <1|2> me
     // sets selection corner to your coordinates
!we pos <1|2> pl <player ID>
     // sets to player's coordinates
!we pos <1|2> cur
     // sets to your cursor
Alias: "!we setpos"

!we expand <amount> [direction]
     // enlarges the region by <amount> blocks in the specified direction
!we expand <amount>
     // expands in the direction that you are looking
!we contract <amount> [direction]
     // contracts the region by <amount> in the specified direction
!we contract <amount>
     // contracts in the direction that you are looking
!we shift <amount> [direction]
     // moves the selection by <amount> in the specified direction
!we shift <amount>
     // moves the selection by <amount> in the direction you are looking


Region operations:

!we set <tile>
     // changes all tiles to <tile>
!we replace <to tile>
     // replaces all non-empty tiles (everything except 0) to <to tile>
!we replace <from tile> [to tile]
     // self explanatory
!we walls <tile>
     // makes walls out of <tile> inside your selection
!we hollow [tile]
     // leaves walls in your selection and fills the inside with <tile>
!we hollow
     // leaves walls in your selection and clears the inside out with tile #0
!we regen
     // regenerates the selection region (restores all tiles to the original ones)


General:
!we coords
     // shows your current coordinates
Alias: "!we c"

!we reload
     // reloads WorldEdit

Version 0.3a
worldedit.data.degreeToDirection offsets, down-left was recognized as up-left

Version 0.3 - 17.04.2014
Graphical region selection (uuuh, fancy!)
!we expand <amount> [direction] - enlarges the selection in [direction]
!we contract <amount> [direction] (equals expand with negative <amount>)
!we shift <amount> [direction] - moves selection by <amount> tiles in [direction]
!we coords (!we c) - shows you your current coordinates
Chat string parsing (again)
TileToPixel calculation, which I broke in the last version
!we hollow replaces the center with tile 0 when argument #3 is not given
Debug output when setting position to cursor
Initializing useless data on join (pos[1] and pos[2])

Known bugs:
replace and walls commands have no error message when toTile (argument #3) is missing
It is possible to expand/shift a region outside the map boundaries
Tile validation doesn't depend on current maps tiles

14.04.2014
!we walls <tile>
!we hollow <tile>
!we regen
!we pos now accepts cursor position (!we pos <1|2> cur)
PixelToTile and tileToPixel calculations (+1 too much)
Validation of coordinates
Updated reqcld2 function to support mode 4
A few console debug outputs

13.04.2014
!we limit works now
!we replace <fromTile> [toTile]
Each region modifying operations shows changed blocks
String parsings inside commands