It just seems to me like relevant, interesting questions get closed all the time because just because. It's getting pretty annoying from the StackExchange network.
For human-friendly URIs, I would've liked to see Doug Crockford's Base32 encoding (http://www.crockford.com/wrmg/base32.html) instead of hexadecimal. Case-insensitive, but still more compact than hex.
I've grown more and more into thinking having a database is maybe overkill for only a blog. I do use Octopress too and it really makes you think "do you really need a DB for that?"
If you compile your posts into HTML, use Javascript for more dynamic content (like comments by Disqus or a Twitter feed, for example), HTML files take almost no resources to serve, so you can handle a huge load without many resources.
Ironically, it sounds exactly like what Apple is doing with iOS/iPhone. "All our apps should come from the app store because we review them and blah" Considering Android's position of "you can install APKs, but at your risk," I find this bizarre. Is Google slowly becoming Apple?