Actually before i used iGoogle gadgets for your site. There are lots of interesting widgets that you can add into your website to enhance its functionality and user friendly environment.
Just dont overdo it because it might slow your website too.
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I use it and love it! I have tons of widgets but I would say the two that I use the most is my widget to track stock prices and my Gmail email widget. I also have a tab setup for Google Documents which is nice.
iGoogle is useful for monitoring, for a start you can set up Google Reader to display on the page for RSS feeds related to certain clients eg Google news.