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* Sometimes I want to keep up with new comments on a specific thread I'm interested in. There is no easy way to do it, I have to manually "poll" the item page, and it's far from optimal. The biggest problem being, I can't easily see new comments.
* Similarly, I'd like to be able to quickly see new submissions/comments from some users.
I'm planning on building a small app to remediate to this problem. Basically the plan is to provide RSS feeds for top-level items and users, so that I can quickly see new content on a RSS reader. Maybe I would extend this with a website that would allow you to sort comments by novelty and other things like that (+/- a HN-specific RSS reader).
I would like to know if someone else is interested by this idea, or if someone can point me to an already-existing solution. If there are several people interested, I would put much effort into this project, and don't make it usable only for me :-)
P.S: I know HN has some limitations about crawling, but I think if one almost only polls ~ once/minute the /newcomments, /news and /newest page, the amount of data could be sufficient.