I'm looking to address a pain point that I have come up against often - having thoughts that would make great blog posts but no time or motivation to go through the hassle of having a full blown blog.
I've outlined what I have created here: http://idea.kickofflabs.com/
If you are interested please sign up there or drop me an email at damaswill@gmail.com. It would be great to hear from you.
In the middle, people post comments on others' blogs or on meta sites such as HN.
I can't be sure, but from what you've said so far, I'm not seeing much unaddressed pain in the space.