Nice idea, but I'm seeing a few problems.

Clicked the "A JVM does what" link on the twitter feed and after a wait that was an eternity in internet time (probably int he 10 second range or more) the page looked like an iframe with the original url loaded in.

And the interface is confusing. It is never good when I first feel like crying out in rage that there are none of the promised comments, then only realize where to find them after reading your explanation a few times to pinpoint the info (I'm a product of the internet, read very sparsely :P)

My suggestion is to make it more obvious where the comments are, or even to parse them out of the HN page and display them in your own way.