Okay, figured I should finally chime in. :)
In what might seem to be a bit of a divergence from the core of WP, my site is not a blog, rather it's a news/reviews site. The codebase has been extensively modded ('core', 'hacks', & 'plugins'), and a lot of the modding is original code (though in some specific cases, non-original concept!). I have tried for the most part to push larger solutions back to the community, and certainly attempt to keep an eye on the forums for people needing quick 3-10 line PHP examples... :)
I find myself, unfortunately, spending too much time working on the site (design, code), and not enough on the content. And for the site to really take off, it needs frequent updates of useful content. But I'm at about 400 unique readers per week, so that's pretty good -- I'd like to be in 400+ per day range by Summer. A lot depends upon whether I can start to generate interest, hype, and again, content. ;)
Always interested in feedback, ideas for articles, reviews, how-to guides, etc. Might even be looking for some writers if things start to pick up. Fire away!