Third alpha of Drupal 7 available for testing

The third alpha release of what will become Drupal 7 is now available for testing.  The most notable change for developers is Drupal 7 now ships with jQuery 1.4 and jQuery UI 1.8. They’ve also fixed a number of critical issues since the previous alpha, most importantly one that caused passwords to be stored in plain-text under certain conditions.

Changes since DRUPAL-7-0-ALPHA2:

• Drupal 7 now ships with jQuery 1.4.2 and jQuery UI 1.8.
• API change: AJAX commands are now defined as array(‘#type’ => ‘ajax’, ‘#commands’ => $output) rather than array(‘#type’ => ‘ajax_commands’, ‘#ajax_commands’ => $output).
• API change: There is a new form element #type ‘text_format’, should be used for textareas with format selectors (e.g. body fields).
• page–front.tpl.php works again.
• Bug where IE quits displaying any CSS after 31+ stylesheets now fixed.
• The “Add” link now shows up for blocks. :P
• Now, running drupal_execute() multiple times on forms will validate each time, instead of only the first one.
• UI for translatable fields removed, in favour of contributed module.
• MAINTAINERS.txt now actually approximates the truth.
• Numerous upgrade path fixes.
• Numerous documentation fixes and documentation holes filled.
• Numerous markup fixes and improvements.
• Various performance improvements, especially around data import.
• Numerous security fixes, including both forward-ports of 6.x holes and plugging a D7-only one where Drupal 7 was storing plain-text copies of passwords in user.data under certain conditions.

More details: http://drupal.org/node/748690