Just FYI: you _can_ use Jetpack without connecting it to a WP.com account. You won’t be able to use the CDN, Protect or Publicize modules, but its Custom Post Types, social menus, Markdown support and a whole bunch of other things will work just fine. (It’s called “debug mode,” which is a bit of a misnomer.)
A little while ago, I switched from WordPress to ClassicPress (and back). While on ClassicPress, though, I needed something other than Jetpack’s Markdown module to render my “Notes” to good ol’ HTML.
Jetpack, turns out, will append geolocation data—if present—to your posts.