There are people who I find I trust to make smart submissions and smart comments. However, with the increasing popularity of HN it's all too easy to miss a submission or comment by them. Sometimes by fluke of timing or something an otherwise worthy submission gets missed, un-upvoted, and sinks without trace.

I'd welcome a system that finds items it thinks I'd find interesting and brings them to my attention. the occasional false positive will mean that I see things I otherwise might ignore, and I would get the chance to upvote things I think deserve it.

The fact that there are so many people doing or thinking about something similar shows that there is a need. Or at least a want.