We (BakedCode) built http://prompt.im http://prompt.im a few months back as a bit of fun (took us about 1-2 days to build) which sounds like what you're after.

We (BakedCode) built http://prompt.im http://prompt.im a few months back as a bit of fun (took us about 1-2 days to build) which sounds like what you're after. Here's an example: http://prompt.im/hackernews http://prompt.im/hackernews