This is a very important patch, but one that is merely an enabler.
  Hopefully we'll see more people submitting "action patches" in the
  near future.

  Thanks for the hard work and persistence, John.  *If* you decide
  to update the Drupal Pro Development book to Drupal 6, make sure
  to add a chapter on actions. ;)

- Patch #153535 by traxer: according to the XHTML1 Strict specification, it is not allowed to generate empty <tr></tr> tags.

#123577 by spatz4000 (originally by tostinni for Drupal 5): do not allow hidden profile fields to be browsed by non-admins

#154949 by Crell and dww: let modules and themes specify a minimum required PHP version, under which they will not be possible to be turned on

#153998 by pwolanin: separate edit a delete permissions, so people who can edit a node cannot delete it too automatically

#154218 by Steven: HTML to text email converter, centralizing email wrapping in Drupal core and providing a solid conversion function for contributed modules

#154224 by hunmonk: add destination argument to _drupal_delete(), instead of using drupal_goto() directly, so the callback cycle can complete

#150210 by bjaspan and Frando: explicit table names for create table statements and fixing a schema referencing bug

#152670 by myself: refactor PO generation to decouple data collection, file generation and HTTP download; fix a bug with plural exports along the way

#151280 by Rok Žlender, webernet and myself: use the real cache system, once we have the database set up, to get the values set by the configuration form and the install profile to the proper cache values

#133028 by alienbrain and Moshe Weitzman: allow positioned submit buttons in node forms via form_alter by not hard-coding the button order

  Let this be the day where we help revolutionize the online society, and the
  way websites and web services interoperate.  Or something.