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Try the VoidGenerator. It generates a clean world with a piece of bedrock in the middle

http://dev.bukkit.org/bukkit-plugins/voidgenerator/

Thanks for the help peeps, but what im looking for is different.
I want 1 chunk to generate, and the rest to be air.
I heard this was possible using both the multiverse and the VoxelSniper plugin together but I dont know how.

Singleplayer - Create New World -> More World Options -> World Type: Superflat world, preset: 1;0;1 (sets whole world to air)

Generate Structures: OFF

or or or... you could press create new world then more world options then click world type:superflat land THEN customize after that delete the grass layer and the dirt layer then go and press preset and change 7 into 0 and then press eneter it should have a layer of air. if it does go ahead and press done then uplaod that world onto your server.

Well WorldEdit would be a fairly easy thing to do. If you are going to make it in single player you could always use MCEdit and use a nice little feature on that to load all the chunks as all air.

It should be pretty simple.. Dig to the last layer of bedrock, do //wand, left click that bedrock, fly away pretty far diagonally from the first hole, then go down to the first layer of bedrock again, right click that bedrock, then //set 0