Fun Fact: You can get the API secret key out of twitter's official client. Which will allow you to use their xauth system (no browser oauth required - only enter username/password).
Also great for spambots: Twitter can't ban the app because then they had to ban their official Twitter clients.
/edit: have fun
'key': 'Fpl5UUVwvaczUzzpVJ8Rlw'
'secret': 'z73HF21zCz5CaxzDM6M0OPeaCBYGfHUG3FYBgcMB2Y'
'key': '3rJOl1ODzm9yZy63FACdg'
'secret': '5jPoQ5kQvMJFDYRNE8bQ4rHuds4xJqhvgNJM4awaE8'
One is for tweetie 1.0 and the other is for the official twitter client.