Twitter has introduced this new feature of providing RSS feeds to anyone`s updates. So if you are on twitter then your twitter profile will have an RSS feed to all your status updates. It is located just below the "following " area in your twitter profile page (mark the words: profile page and not home page). Even the Twitter account of Digitizor has an RSS feed. Now get the location of this feed by right clicking on the link to your Twitter`s RSS feed, and copying the link.
Now open the Widgets page in your WordPress Dashboard. Look for RSS in the available widgets menu and click on Add. Once added, click on the edit link of the RSS widget bar which was just placed in the Current Widgets column. Here enter your Twitter Updates' feed URL, click on Done and save the widget.
Now goto your blog and you will se that you can now see your twitter updates on your blog (even though it as a wordpress.com blog :-))