This is a simple thing to achieve but the questions is asked over and over again so I thought it might worth adding a quick tutorial here.  For the sake of an example we will look at how to add your twitter feed to the left hand menu.

Step one.. get the twitter code from here : http://twitter.com/about/resources/widgets/widget_profile

Style it to match the colour, size and shape of your theme.

Your final code will look something like

<script src="http://widgets.twimg.com/j/2/widget.js"></script>
<script>
new TWTR.Widget({
  version: 2,
  type: 'profile',
  rpp: 8,
  interval: 6000,
  width: 'auto',
  height: 200,
  theme: {
    shell: {
      background: '#333333',
      color: '#ffffff'
    },
    tweets: {
      background: '#000000',
      color: '#ffffff',
      links: '#4aed05'
    }
  },
  features: {
    scrollbar: true,
    loop: false,
    live: true,
    hashtags: true,
    timestamp: true,
    avatars: false,
    behavior: 'all'
  }
}).render().setUser('dx3webs').start();
</script>

Step Two

In Magento Goto CMS > Static Blocks.

Create a new block

Title: myTwitter

Indentifier: twitter

Status: Enabled
Content: Paste your twitter code in here.

Save

Step Three
Open app/design/frontend/xxxxxx/xxxxxx/layout/catalog.xml

Add your static block to the left or right section in

 <!-- Mage_Catalog -->

(near the top of the file)
For example to add to the left sidebar.. (Having already removed that damned dog call out)

  <reference name="left">
<block type="cms/block" name="myTwitter" >
<action method="setBlockId"><block_id>twitter</block_id></action>
</block>
        </reference>

Bingo you have a new block showing your twitter updates. Needless to say you can add any html you like.

You can see an example of this working here : http://www.5starvans.co.uk/sales/index.php/new-vehicles.html (site still a work in progress at time of writing)

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