[dotBen]

If you are involved in the startup scene (attend meetups, read HN, have other friends involved in startups, etc) you soon know what startups are around.

If the Internet is just "Facebook" + "Google" to you then, sure you're missing out but by just posting to HN I'm guessing that isn't your world.

If you mean super early startups (and be mindful that there are plenty of reasons not to be the first employee at an unfunded/newly funded startup) then Angel List is probably the "magic resource" you are aspiring for.