Nailed that lame bug that would redirect you to the preview URL after your first post save (but only sometimes).

With the help of AaronCampbell, the shortcode HTML issues have been fixed in a flexible way. Now add_shortcode() takes a third (optional) parameter that allows you to have your shortcode be expanded after wpautop() and texturize() are run. Default is before for compatibility with 2.5. For “block-level” shortcodes, you should probably make them run after. For “inline” shortcodes, you should probably make them run before.

Update: We went a different way with this, for the time being.  Now everything runs at 11, but shortcodes with a buffer line separating them from other content will be recognized as block level and won’t get paragraph-wrapped.

Fixed an ugly bug that broke page links for setups that use PATH_INFO permalinks with %category% at the beginning of the permalink structure.

Making good progress on shortcode (galleries included) parsing and handling. 2.5.1 will run after wpautop(), so shortcode plugin authors will be able to output block-level HTML without WordPress mangling it or wrapping your divs in paragraphs. The rabbit hole goes deeper, however, as the Visual Editor does funky stuff with extra whitespace in shortcodes.

fixing little bugs, commiting patches

trawling through tickets, applying patches, punting new features to 2.6

Ticket 5797 needs attention.  AJAX link category creation.