To locate your twitter ID, you can get all inforamtion about your account from this link. Make sure you replace screen name with your twitter username.

https://api.twitter.com/1/users/show.xml?screen_name=<username>

https://api.twitter.com/1/users/show.xml?screen_name=pgmaynard

Now that you have your twitter ID, you can do cool things such as get your twitter timeline as an RSS feed.
https://twitter.com/statuses/user_timeline/14077578.rss