- Patch #261882 by catch: the beginning of some more install profiles.

The "expert" will be a minimalistic profile for developers.  This opens
  the doors to add more things to the default profile and/or to create
  additional install profiles for core. It also helps set an example for
  more install profiles in the contributed modules repository.

CHANGELOG.txt

@@ -15,6 +15,8 @@ Drupal 7.0, xxxx-xx-xx (development version)
     * Removed comment controls for users.
     * Removed display order settings for comment module. Comment display
       order can now be customised using the Views module.
+    * Added more features to the default install profile, and a new
+      slimmed down install profile for developers.
 - Search:
     * Added support for language-aware searches.
 - Testing:

profiles/expert/expert.profile

@@ -0,0 +1,107 @@
+<?php
+// $Id$
+
+/**
+ * Return an array of the modules to be enabled when this profile is installed.
+ *
+ * @return
+ *   An array of modules to enable.
+ */
+function expert_profile_modules() {
+  return array('dblog');
+}
+
+/**
+ * Return a description of the profile for the initial installation screen.
+ *
+ * @return
+ *   An array with keys 'name' and 'description' describing this profile,
+ *   and optional 'language' to override the language selection for
+ *   language-specific profiles.
+ */
+function expert_profile_details() {
+  return array(
+    'name' => 'Drupal (experts only)',
+    'description' => 'Select this profile to install with only minimum functionality enabled.'
+  );
+}
+
+/**
+ * Return a list of tasks that this profile supports.
+ *
+ * @return
+ *   A keyed array of tasks the profile will perform during
+ *   the final stage. The keys of the array will be used internally,
+ *   while the values will be displayed to the user in the installer
+ *   task list.
+ */
+function expert_profile_task_list() {
+}
+
+/**
+ * Perform any final installation tasks for this profile.
+ *
+ * The installer goes through the profile-select -> locale-select
+ * -> requirements -> database -> profile-install-batch
+ * -> locale-initial-batch -> configure -> locale-remaining-batch
+ * -> finished -> done tasks, in this order, if you don't implement
+ * this function in your profile.
+ *
+ * If this function is implemented, you can have any number of
+ * custom tasks to perform after 'configure', implementing a state
+ * machine here to walk the user through those tasks. First time,
+ * this function gets called with $task set to 'profile', and you
+ * can advance to further tasks by setting $task to your tasks'
+ * identifiers, used as array keys in the hook_profile_task_list()
+ * above. You must avoid the reserved tasks listed in
+ * install_reserved_tasks(). If you implement your custom tasks,
+ * this function will get called in every HTTP request (for form
+ * processing, printing your information screens and so on) until
+ * you advance to the 'profile-finished' task, with which you
+ * hand control back to the installer. Each custom page you
+ * return needs to provide a way to continue, such as a form
+ * submission or a link. You should also set custom page titles.
+ *
+ * You should define the list of custom tasks you implement by
+ * returning an array of them in hook_profile_task_list(), as these
+ * show up in the list of tasks on the installer user interface.
+ *
+ * Remember that the user will be able to reload the pages multiple
+ * times, so you might want to use variable_set() and variable_get()
+ * to remember your data and control further processing, if $task
+ * is insufficient. Should a profile want to display a form here,
+ * it can; the form should set '#redirect' to FALSE, and rely on
+ * an action in the submit handler, such as variable_set(), to
+ * detect submission and proceed to further tasks. See the configuration
+ * form handling code in install_tasks() for an example.
+ *
+ * Important: Any temporary variables should be removed using
+ * variable_del() before advancing to the 'profile-finished' phase.
+ *
+ * @param $task
+ *   The current $task of the install system. When hook_profile_tasks()
+ *   is first called, this is 'profile'.
+ * @param $url
+ *   Complete URL to be used for a link or form action on a custom page,
+ *   if providing any, to allow the user to proceed with the installation.
+ *
+ * @return
+ *   An optional HTML string to display to the user. Only used if you
+ *   modify the $task, otherwise discarded.
+ */
+function expert_profile_tasks(&$task, $url) {
+  module_disable(array('locale'));
+}
+
+/**
+ * Implementation of hook_form_alter().
+ *
+ * Allows the profile to alter the site-configuration form. This is
+ * called through custom invocation, so $form_state is not populated.
+ */
+function expert_form_alter(&$form, $form_state, $form_id) {
+  if ($form_id == 'install_configure') {
+    // Set default for site name field.
+    $form['site_information']['site_name']['#default_value'] = $_SERVER['SERVER_NAME'];
+  }
+}