You can have a command-line based tweeter!
type the following into /usr/bin/tweet
then type chmod +x /usr/bin/tweet (changing the username and password)
#!/bin/bash
# This is a command line Twitter Client
# Set Username and Password –user “<username>:<Password>”
# Usage: tweet “Content of Tweet up to 127 chars”
# Shorten the String to just 126 Chars (just in case)
STATUS=$(echo $1 | awk ‘{print substr($0,1,126)}’)
curl -silent -o /dev/null –basic –user “Username:Password” –data-ascii “status=$STATUS” “http://twitter.com/statuses/update.json”