Java Edition guides/Alpha 1.0 releases

This guide is a simplified overview of all the changes in the Alpha 1.0.x releases, which assumes at least some familiarity with Infdev releases.
==Mobs==
===New===
Cow 		
*Surface		
*Can be milked.
Slime 		
*Underground		
*Comes in 3 sizes.
*Larger slimes split into smaller slimes when killed.
Chicken 		
*Surface		
*Lays eggs.
Spider Jockey		
*Dark places		
*The first composite mob.
===Changed===
Hostile Mobs		
*Now have unique sounds instead of sharing the player's sounds.
==Blocks==
===New===
Redstone Ore 		
*Generates deep underground.	
*Pickaxe (iron or better)	
*Drops redstone dust.
Redstone Wire 		
*Drops from redstone ore.	
*Any	
*Transmits redstone power.
Redstone Torch 			
*Any	
*Powers redstone components.
Lever 			
*Any	
*Toggles redstone components on and off.
Button 			
*Pickaxe	
*Temporarily powers redstone components when pressed.
Stone Pressure Plate			
*Pickaxe	
*Powers redstone components while stepped on.
Wood Pressure Plate 			
*Axe	
*Powers redstone components while stepped on.
Iron Door 			
*Pickaxe	
*Can only be opened by a redstone signal.
Ice 		
*Generates in winter mode worlds.	
*Pickaxe	
*Covers the water in winter worlds.
*Water exposed to snowfall will freeze.
Snow 		
*Generates in winter mode worlds.	
*Shovel	
*Covers the ground in winter worlds.
*Flat surfaces exposed to snowfall will accumulate snow.
Snow Block 			
*Shovel	
*A building block only obtainable in winter mode.
Cactus 		
*Generates on sand.	
*Any	
*Grows more cactus on top of itself.
*Damages entities that touch it.
Reeds 		
*Generates on grass next to water.	
*Any	
*Grows more reeds on top of itself.
*Can be crafted into paper.
Clay Block 		
*Generates in and around water.	
*Shovel	
*Drops clay.
Jukebox 			
*Axe	
*Can play music discs.
Fence 			
*Axe	
*Cannot be jumped over.
===Changed===
Bookshelf		
*Is now craftable:
Bricks 		
*Texture changed.
*Is now craftable:
Sign 		
* Can now be placed on walls.
Lava 		
* Can now set fire to nearby flammable blocks.
Spawner 		
* No longer drops itself when mined.
Furnace 		
* Lit furnaces now drop normal furnaces instead of lit furnaces when mined.
==Items==
===New===
Redstone Dust		
*Drops from redstone ore.	
*Transmits redstone power.
Snowball 		
*Drops from snow and snow blocks mined with a shovel.	
*Can be thrown or crafted into snow blocks.
Leather 		
*Drops from cows.	
*Can be crafted into leather armor.
Milk Bucket 		
*Obtained by using a bucket on a cow.	
*Does not yet have a use.
Paper 			
*Can be crafted into books.
Book 			
*Can be crafted into bookshelves.
Clay 		
*Drops from clay blocks.	
*Can be cooked into bricks or crafted into clay blocks.
Brick 			
*Used to craft brick blocks.
Slimeball 		
*Drops from slimes.	
*Does not yet have a use.
Egg 		
*Chickens will randomly lay eggs.	
*Does not yet have a use.
Music Disc 		
*Found in dungeon chests.	
*Can be played in a jukebox.
===Changed===
Leather Armor 		
*Now crafted with leather instead of wool.
*Renamed from "cloth" armor to "leather" armor.
Arrow 		
*Now crafted with flint instead of iron ingot.
Wooden and Cobblestone Stairs		
*Inventory icon is now a (bugged) 3d model instead of a flat texture.
Wooden Door 		
*Has a new inventory icon.
==Non-Mob Entities==
===New===
Boat 				
*Can be used to cross water.
Minecart with Furnace				
*Can be used to push minecarts.
Minecart with Chest 				
*Can be used to transport items.
==Structures==
===Changed===
Oak tree		
*Can now sometimes generate in larger and more complex shapes.
==Gameplay==
===New===
Executable Client	
*Before this version, Minecraft was only playable through a browser.
Cave Sounds 	
*Added cave ambience.
es:Guías de Java Edition/Alpha 1.0 releases
ru:Руководства по Java Edition/Релизы Alpha 1.0
zh:Java版指南/Alpha 1.0版本