For your smaller Twitter API projects, bash scripts etc, we have launched SuperTweet.net in case you don’t get OAuth implemented by the time Basic Auth goes away June 30, 2010. It’s a Twitter proxy – you use Basic Auth to talk to the proxy, and it uses OAuth to talk to Twitter.
SuperTweet.net Access Credentials
For example, to send a tweet, use the http://api.supertweet.net/1/statuses/update.format such as:
curl -u user:password -d "status=playing with cURL and the SuperTweet.net API" http://api.supertweet.net/1/statuses/update.xml
The password shown in the example above is never your real Twitter password, but a separate password you set up just for use with the SuperTweet.net API – As with Twitter OAuth, you can revoke, change, or disable that password without any impact to your real Twitter password or Twitter account. Also, you can deauthorize the SuperTweet.net API application itself on Twitter.com if you think it’s being bad, again, without affecting your real Twitter password or other Twitter applications.
Learn more: http://www.supertweet.net/
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Here is an updated answer
A shell script to post to Twitter from the command line for both Linux and Mac:
http://360percents.com/posts/command-line-twitter-status-update-for-linux-and-mac/