This is the Spoutcraft patch, without needing to buy the game...
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Download this, it is crucial you only have minecraft.jar in the folder with the exectuable, or it will copy everything else in that same folder into your mincraft folder, and you do not want that to happen.
Leave it in the folders I have zipped it in, or you will regret it, I couldn't be bothered fixing the code up, so, just listen to what I am telling you to do, and you will be fine.
You can either put the minecraft.jar in the folder itself, or run my little app, but listen to my warning!!
Instructions for use;
Download it.
Unzip it, leaving it in those folders.
Close minecraft.
Run
MinecraftPatchyThing
Click the button.
Wait for the message.
If you get an error, you may need to run as admin.
If no error, or passed the error.
Your minecraft will be patched.
Open MC as usual and play.
You should make a back up of your game just in case you want your old jar back, or you can always click "Force Update" to revert it all back to Vanilla.
If you don't know what I am talking about.