http://hnwatch.scalien.com
Demo account: demo/demo
Hacker News Watch monitors submissions so you don't miss out on topics, comments and commenters relevant to you.
You add keywords (like a Google search) which are saved as permanent searches. Hacker News submissions and linked pages are monitored for your keywords. Results are delivered to your browser in real-time via a Google Reader type interface.
It's a release-early-release-often type release, so it's still rough around the edges (eg. broken on IEx.x). We'll work on features/bugs based on your feedback.
About the project: When we released Keyspace, our replicated key-value store, we would gladly have payed $10/mo. for a service to monitor the real-time web for comments about us, so we can quickly react and make connections. The existing sites ("social media monitoring") are not very good, so we started building our own. HNWatch is a HN-only toy version of this more general product, which is also our primary use-case for Keyspace development.
Hacker News Watch has been OK'd by pg.
First, it won't let me use "old-gregg", then I use "oldgregg", I click "Register and Login" and nothing happens.
Edit: hitting enter on that form works. I guess the bug is that you don't re-enable submit after a user corrects his input.