I like backtype, but searching for "justin.tv" gives it fits. It keeps giving me things about random "Justin"s, or about "TV"s, which is not what I'm looking for.
i've been using the backtype alerts for a while now, looks like techcrunch is summing up old news (plus the little tidbit about subscriptions at the end
You're right, we launched alerts a little while ago, subscriptions are the new addition to the alerts service today.
Hope the alerts are working out well for you. If you're looking to keep track of lots of threads on news.yc give subscriptions a try and let me know what you think. (mm [at] backtype [dot] com)
With subscriptions we'll update you by email or RSS whenever a new comment is made on a post or HN thread you're following.