Bukkit

If you find WorldEdit useful, you can:

This version features official support for Minecraft up to version 1.2.

• Made #region mask keep the region selected when the mask was added, and added #dregion mask that always uses the player's current
  selection
• Allow inverted and under/overlay masks to affect masks, making them more flexible. This allows for things like /gmask !$biome and
  /gmask >>>#region
• Added basic entity handling with copy and paste. Paintings do not currently respawn properly, entity pastes cannot be undone yet, and
  schematics do not yet store entities
• Added getChunkCubes() to Region to get 16^3 chunks a region overlaps with
• Cleaned up ContainerBlock inventory reading from NBT.
• Added a command to list schematics and the abilitiy to autodetect schematic format when loading schematics
• Added support for multiple schematic formats
• Corrected flag checks for biome commands
• Added allFlags setting to Command to prevent it from restricting allowed flags (for dveleopers!)
• Make sure all WorldEdit files are in the plugins/WorldEdit folder
• Added initial support for plugin channels with WECUI
• Remove error-prone redundancy in Polygonal2D min/max management
• Updated for SpoutVanilla changes
• Added Falling sand/gravel entities to /remove command
• Added support for new tree types to TreeGenerator and make adding more tree types later easier
• Updated for changes to SpoutAPI
• Fixed FloatingTreeRemover (/tool deltree) to work correctly with jungle trees
• Fix bPermissions instanlled check
• Add a -f (friendly) flag to butcher which applies -a, -n, -p, and -g, and a -g flag which allows butchering of iron and snow golems
• Add FlatRegion interface and an associated iterator (for developers!)
• Fix a NPE with brush using a global mask and no brush mask
• Fixed //shift not updating polygonal regions properly.
• Add support for expand with reverse dir for Cylinder & Ellipsoid
• Make inset/outset use varargs contract/expand, so they can be used with cylinders and ellipses.
• Add positive() to Vector and Vector2D
• In WorldGuard, teleport/spawn location yaw/pitch should now work.
• Register command permissions, integrate with the Bukkit help API
• Allow annotation-free registering of commands with other plugins (for developers!)
• Added default radius setting for butcher and added permissions for killing pets, npcs, and non hostile animals.
• Added support for new Anvil saving format, fixed old chunk saving format.
• Clean up some stray 128 values and update the fallbacks to 256
• Add support for 1.2.4 and newer
• Updated for new 1.2 and 1.2.4 blocks, items, and mobs
• Fix Dispensers, Furnaces and remove redundant casts.
• Fix restoring enchantments from snapshots/schematics.
• Made tree planter tool try 10 times to make the tree before giving up.

Thanks to Nidan, aumgn, Jadedwolf, wizjany, SpectralEdge, md_5, and desht for their contributions