No worries - They are mostly just nitpicks - I think it's a interesting concept.

I'll fire you a screenshot when I get back tonight.

The community question is an interesting one - the site would be more sticky if it's relevant to the users. e.g. HN is useful because it's relevant to me in the startup domain, and the community reinforces that. At the same time, you also need to have it a little bit diverse to keep people interested.

So yeah, it's a fine line - but as you say, this could be something that evolves rather than being designed. I'm guessing the initial selections will jumpstart it in one direction or another.