From the FAQ: How Do I Increase API Limits ? - You visit whitelisting request form basically if you indicate you are a developer and are "testing a rest api"

From the FAQ: How Do I Increase API Limits ? - You visit whitelisting request form basically if you indicate you are a developer and are "testing a rest api" application they will approve your IP address to 20,000 calls per hour. DO NOT SAY YOU ARE USING TWITTER BUTLER - otherwise they wont approve your request. Gee, a real legit player then. Not much sympathy from me.