- Patch #1219236 by Gábor Hojtsy: locale module includes 1350+ lines of unneeded code on all page loads.

#1007488 by Gábor Hojtsy, plach, droplet: Fixed Drupal cannot be installed in a non-predefined language

#534556 by karschp, coltrane, Bojhan, David_Rothstein: Fix double appearance of the settings.php message in the installer

#346494 by hswong3i, Pancho, Dave Reid, duellj, dalin: Fixed DB drivers need to be able to change the configure database form during install

- Patch #689954 by Mark Trapp: installation complete message doesn't conform to Drupal path conventions.

#938470 by Kevin Hankens: Change error about file permissions on settings.php during install to warning instead.

- Patch #818374 by Damien Tournoud, ksenzee, Dave Reid: add a requirements check error if PECL PDO is being used.

- Patch #140783 by sun, chx, effulgentsia, David_Rothstein, webchick: a select list without #default_value() always passes form validation.

#882164 follow-up by Gábor Hojtsy, reglogge: Further clarifications to localization install instructions.

#418302 follow-up by David_Rothstein, reglogge, dww: Deal with obscure edge case when attempting to create settings.php during installation.

#882164 by aschiwi, Gábor Hojtsy, David_Rothstein, reglogge, et al: Fix the 'install from another language' instructions so that they actually work.

- Patch #910572 by sun, David_Rothstein: command line installations are broken (programmatic form submissions don't need a theme?).

#418302 by David_Rothstein, dww, reglogge, and lots and lots of other people: Copy default.settings.php to settings.php during install if webserver owns files. Eliminates 'red error of death' during install for most shared hosting set-ups.

#898654 by chx, Damien Tournoud, alex_b: Fixed Required modules not installed before optional modules.

- Patch #323477 by justinrandell, boombatower, tstoeckler, Damien Tournoud: increase simpletest speed by running on a simplified profile.

- Patch #195416 by Damien Tournoud, David Strauss: table prefixes should be per database connection.

- Patch #807396 by Berdir, carlos8f, David_Rothstein: database errors not displaying during install.

- Patch #312144 by CorniI, dropcube, EvanDonovan, Damien Tournoud, David_Rothstein, tstoeckler: install fails when default.settings.php is not present.

- Patch #585012 by jpmckinney, David_Rothstein: setting a default theme in install profile causes WHACK errors.

- Patch #790832 by David_Rothstein: install_configure_form_submit() unnecessarily mangles the () array.

- Patch #752814 by David_Rothstein, Gábor Hojtsy: installer forces user_email_verification() to TRUE.

#409410 by hunmonk, David_Rothstein: Don't clobber install profile messages on final page of installer.

#758804 by David_Rothstein: Remove unnecessary calls to rebuild module and theme data in the installer.