The code looks like this - modify and put a xml file to your iGoogle built in gadget hosting. Here is the gadget working in Google Sites. Web Disqus.

This also works within a iGoogle Tab in a canvas mode(after it is put in a page with url). You can watch your forum activity within the iGoogle. You set the shortname, url and title and it works. It may also help to form a Discussion Group within iGoogle. All members of group set the same Shortname, url and title. A more complex gadget will help multiple groups in one gadget. Community power in iGgoogle.

here is the xml of gadget Disqus gadget xml  and see gadget page - Disqus in iGoogle.

How To -

• First have an account with Disqus.
• Create a Community or Forum (this has the short-name)
• Put in a Google Site with Domain on any page.
• The URL example - - http://www.yourdomain.com/about
  
• A Title - like  - - My Life and my Town
• Set the short-name, cross-check in your disqus dashboard
• Then check at the URL you have set, not while editing.
• Even monitor changes in a disqus iGoogle gadget with same settings.
  

Try Make your own file "disqus-gadget.xml"  edit in Notepad++ only. see my xml and use. Do not use RTF editors, word or front page to do these things. use a RAW text editor. It can have Color Syntax.

You have to create a community in disqus like me disqus with dapj, Then use the short name they gave, the url of the google sites page - full url of page without https: please use http. A title for that page or a unique title. Be consistent and exact in these three. Then you can use that community gadget in iGoogle too. In anybody's iGoogle if they have these three parameters.