Ask HN: Links and comments side-by-side in the same window?

Has anyone else ever thought it'd be a good idea for you to be able to look at an HN link, and have the HN comments on it side by side in a separate frame or something? Instead of having to open two tabs, one for each?

Thought it would be nice contextually, since the HN commenters are really smart and often add a ton of value to whatever the article is actually talking about.

Knowing HN this may have already been created and I just don't know about it.